From an earlier toread, I now bring you the juicy quotes:
Companies are realizing that the millions they've spent on "knowledge management" systems got them little more than confusing document repositories. So folks like Socialtext can package a compellingly light tool of blogs and wikis, and sell it cheaply enough that it doesn't require budget approval from IT, and people can get their collaboration done without hassle.
No one likes talking to enterprise software salesfolks, no one likes the 3 to 6 months that the sales process takes, no one likes the 6 to 12 months that deployment takes, no one likes the costs, and almost no one likes the results. Enterprise software succeeded, though, because there weren't many other viable options.
That, of course, is changing.
I sure wouldn't want to be working in enterprise software right now. Sure, it's a massive industry, and it will take a long time to die, but the progression is clear, and, frankly, inevitable.