Lake County (57% for Bush)
    The Orlando Sentinel (click to read article) inspected more than 6,000 overvotes (they did not look at undervotes) in Lake County and found more than 600 legal votes.  The discarded ballot contained 376 Gore votes and 246 Bush votes, a net gain of 130 votes for Gore.  Similar overvotes were canvassed during the automatic recount in Seminole, Gadsden, Polk, and Orange County.

Hillsborough County (52% for Bush)
    The Tampa Bay Tribune (click to read article) canvassed Hillsborough's 5,282 undervotes (they did not consider overvotes).

Total Gore gain if counting all indications of voter intent: 120

Total Gore gain if only counting ballots with penetrated chads: 23

Here is the breakdown of exactly what was found on the undervore ballots as reported by Anothy York of Salon.com
http://www.salonmag.com/politics/feature/2001/01/03/recount/print.html

Total undervotes: 5,282
No mark: 3,655

Punched clearly but not tallied by machine:
Bush:47
Gore: 42

Hanging chad total:
Bush 91
Gore 119

Dimpled chads:
Bush: 660
Gore: 757
 

Dade County
The Palm Beach Post completed its review of Dade County's 10,600 undervotes (they did not count overvotes).  A breakdown of the vote types was not provided in the aricle (click here for article).  Roughly 500 ballots with dimpled chads and hanging chads were found, the net total of which had they been counted would have given Bush six additional votes.

Here is an excerpt from that article by Clay Lambert and Bill Douthat:

"If everything were counted -- from the faintest dimple to chads barely hanging on ballots -- 251 additional votes would have gone to Bush and 245 more would have gone to Gore, The Post review showed. The review, concluded last week, also showed that the vast majority of ballots rejected as under-votes (meaning there was no clear punch for any candidate) when counted by machine appeared, in fact, to cast no vote for president.  About 7,600 under-votes had no mark at all on the
presidential column, or in  rare cases included multiple votes that defied judgment. Most of the voters who did not indicate a vote for president did punch choices in other races.

But at least 2,257 voters apparently poked at their ballot cards without properly inserting them into the voting machines. Miami-Dade County Elections Supervisor David Leahy said that's because the voters failed to follow directions.  Of these miscast votes, 302 more would have gone for Gore than Bush, under Leahy's theory."
 

Orange County (click here for article)

The Orlando Sentinel reports:
"Al Gore would have gained more than 200 extra votes if Orange County had conducted a hand recount of all its ballots that machines could not read after the Nov. 7  election.

Results of a new hand count released Friday by  Orange County election officials, and an Orlando  Sentinel examination of rejected ballots, found clear presidential votes on 799 ballots for which counting machines had detected no vote or votes for multiple candidates.

The findings show that -- had Orange County’s  canvassing board examined all its ballots -- George W. Bush would have gained 298 votes and Gore would  have picked up an additional 501. That would have given Gore a net gain of 203 votes -- equivalent to more than a third of Bush’s 537-vote winning margin in Florida."
 

Collier County (click here for article)

This report did not break the findings down into groups, they simply noted a net gain of 226 votes for Bush, "assuming that all dimples, pin pricks, chads and other obvious ballot markings  would have counted — a subjective standard — Bush gained another 770  votes in Collier County. Gore would have gained an additional 544 votes."

                Total number of undervotes: 2,080
                Bush votes: 770
                Gore votes: 544
                No vote cast: 613
                Misaligned votes (Spaces punched for no listed candidate): 106
                Other candidates' votes: 31
                Overvotes (more than one candidate): 16
 

Small County Count (click here for article)

Please note, this count seems to also include the previously reported Lake County results of 130 net Gore votes.

The Orlando Sentinel Reports:
"Thousands of potential presidential votes were lost in Florida's most error-prone counties because of confusing ballot designs, inconsistent counting  methods or because elections officials simply never looked at ballots that were rejected by machines.

The first examination of ballots in the state's 15  counties with the highest rate of discarded votes found more than 1,700 ballots on which a voter's choice for president could be easily determined.

The 15,596 discarded ballots, examined in a joint project by the Orlando Sentinel, the South Florida Sun-Sentinel and the Chicago Tribune, were identified by elections officials as "overvotes" or "undervotes," meaning counting machines either detected multiple votes for president or no votes at all.

While all but one of the mostly Republican counties were won by George W. Bush, the study showed that most of the clear votes that were thrown out were for Al Gore. In fact, had canvassing boards tallied those ballots during Florida's long recount, Gore would have seen a net gain of 366 votes -- equivalent to two-thirds  of Bush's 537-vote winning margin statewide."