A: 

I once found it interesting to read Big Blues: The Unmaking of IBM, about IBM and the start of the PC industry. It's not a biography about any one specific person, but similar (about history and people).

ChrisW
+6  A: 

This is a great book about Linus Torvalds: Just for Fun: The Story of an Accidental Revolutionary

dicroce
I've got this book, its both interesting and funny
daz-fuller
A: 

See the biographies in wikipedia e.g: http://en.wikipedia.org/wiki/Category:People_in_information_technology , http://en.wikipedia.org/wiki/Category:Computer_pioneers , etc...

Pierre
These links do not refer to books - but Wikipedia biographies.
Kjensen
+3  A: 

Okay so it's a TV program, but I found Triumph of the Nerds to be very interesting.

Patrick McDonald
Great program! Well worth the watch.
Alan
+2  A: 

Soul of a new machine

Fire in the valley

There is also some interesting stuff in "Founders at work" - most interesting to me is the contrast between bright people like the RIM guys, Adobe guys and Woz on one hand and the lucky web startups that just made money by being in the right place on the other. Some of those guys shouldn't even be in the same book.

I'd recommend the first two, but not sure I would recommend spending for the founders at work.

Cuckoo's egg is a pretty good read.

I found the biography of Nicola Tesla to be amazing as well.

Tim
+5  A: 

iWoz - Steve Wozniak

iCon Steve Jobs

MicTech
"I Con" is very appropriate for mr. jobs... Truly a fitting title - in all meanings
Tim
+1  A: 

I enjoyed Alan Turing: The Enigma.

dorzey
+1  A: 

Not quite a biography but a lot more: The Annotated Turing

Bedwyr Humphreys
+1  A: 

A video not a book, autobiography, a C.S. professor (not I.T.): Randy Pausch Last Lecture: Achieving Your Childhood Dreams

ChrisW
+1  A: 

Also not quite a biography, rather a string of parts of biographies that make up an epic story: "Hackers" by Steven Levy. On the same vein, "A History of Modern Computing" by Paul Ceruzzi.

JCCyC
i forgot the hackers book in my list.
Tim
+4  A: 

Out of Their Minds: The Lives and Discoveries of 15 Great Computer Scientists, includes Backus, McCarthy, Dijkstra, Knuth, Tarja, Lamport, Kay and 8 more famous names: a chapter on each so not full biographies but a useful introduction to each one.

mas
+2  A: 

Show Stopper!: The Breakneck Race to Create Windows NT and the Next Generation at Microsoft by G. Pascal Zachary is a great read. It's a biography of Windows NT, but contains mini bios on Dave Cutler and many of his development team members and their families.

Alan
A: 

short biogs of woz and jobs

mikej
A: 

It's not out quite yet but I'm looking forward to Coders at Work by Peter Seibel.

seth
A: 

Not exactly a person's biography, but rather Logic's (and IMHO Computer Science's) biography. It's worth the time. logicomix

Petros