Trade means to give the person a tape in exchange for the tape they're sending you. Generally, you give them the same quality tape and length. Don't expect them to just "send" it to you for free, there are costs involved. Most of the time, they're looking for other dramas or anime titles. Don't offer them something they already have.
For distribution or trade:
Japanese Drama Trading Club
Various dramas, to trade between dorama fans
http://www.oocities.org/Tokyo/Towers/8584
Available: Virgin Road, Hoshi no Kinka
For trade/request:
kyosuke@uclink4.berkeley.edu
Available: Under the Same Roof 1-2, Long Vacation, Hoshi no Kinka 1-2
I will try to add more sites as I find them.