See www-306.ibm.com 
Has been purchased by Ibm Corporation for US $2.1 Billion as of December 6, 2002.
A good thing... now we should get better Linux support out of them. As an independent company, Rational had the habit of asking "how high?" every time Microsoft said "jump".
Products:
List, A to Z
Other stuff to get you to use the Rational Unified Process. Isn't it the other way -- RUP is something to get you to buy all the tools in the Rational suite?
Development Conference 2007
See original on c2.com