The concept of augmenting our senses using technology has been talked about as early as 1665.
But even now, we interact with our PC's in much the same manner as would have a person ages
ago (except for some multimedia, voice processing, ergonomic keyboards, mouses..).
Now researchers are pointing the way towards more natural ways of communication with our PC's, by using technologies such as head mounted displays, finger tracking pointers, remembrance agents among others. MIT is leading the way in this technology.  To put in their own words, "...by designing a networked, multimedia computer that can be worn as clothing or is built into the user's clothes, the power of computing can assist everyday tasks..".
A separate home page set up for this purpose tells all what we want to know about 'Wearable Computing'. Practical tips, and manufacturers are also listed.

Related Links:
[Reducing the size of various components required for computing, is one of the key requirements of the wearable computing paradigm. IBM manufactures 170 MB/ 340 MB micro HDD's with a size of 42.8 x 36.4 (mm), and a weight of 16g max (!!)]

[Java Ring is a computer with 6 KB of memory which can be worn around (Guess !), your
fingers !!]

[A wearable motherboard! No kidding! This is just what researchers at Georgia Tech have done. Click here to link..]

[Click here to know about a watch that can page, receive calls, serve as an organiser..This is made by Beepwear, an alliance between Motorola and Timex.]

[Here's a watch that can make calls..from Swatch, Germany]