out of curiosity i looked last night to see what companies were offering portal solutions. a portal solution offers functionality similar to my yahoo. i thought i would pass it along. what i found is that there are offerings from application server companies (ibm, oracle, sun), erp companies (SAP and peoplesoft), and "pure plays" (Epicentric, BroadVision, Plumtree, and Bowstreet), to name a few. According to one article, Epicentric is the market leader, and Bowstreet is the leading innovator.

another article said:
"Plumtree and Epicentric still offer the most thorough portal products today," additionally naming named Vignette and SAP Portals to the group offering "the most usable portal framework products." It also named Oracle and BEA Systems as other vendors "best prepared to serve enterprise portal needs."

http://techupdate.zdnet.com/techupdate/stories/main/0,14179,2854468,00.html

http://www.informationweek.com/story/IWK20011101S0014

http://www.line56.com/articles/default.asp?ArticleID=3562&ml=2