I'm an author, doing last minute fact checking for my book on women in
prison. One of my chapters features www.jailbabes.com, and it's owner,
Ken Kleine. I wanted to do some fact checking with him to make sure
all info was up to date. But when i clicked on jailbabes, all that
came up was that the site name was for sale. So, question is: a) when
did jailbabes dissappear? b) why? And c)how can I reach Ken Kleine to
re-interview him?

Several online articles about Ken Kleine say that he lives in Palm
Springs, California. I couldn't find hide nor hair of him on the Web
at this time, just a plethora of old references.

Looks like the domain went up for sale on July 07, 2003.  I dont know
why.  Hope this helps.
                Coldglow

Try www.archive.org which might have an archived copy.  (BTW, this
sound like a porn site.)

From Archive.Org is appears the site disappeared around June-July
2003.  There is a good archive copy on June 21 but none on July 7. 
The last good archived copy is at:

http://web.archive.org/web/20030621031252/www.jailbabes.com/

USSearch.Com has thirteen entries for various people named Kenneth
Kleine in California.  You can purchase all of them for $14.95 from
that website.