Domino is a great tool for rapid development
I learned and used Domino for years, without much support. It was a great way to do rapid application development and later to put everything on the Web. I really miss it, but trying to explain what it does, WITHOUT mentioning the e-mail components, is difficult even when you actually know what can be done with it.
Even then, I never understood the Sametime etc things that kept being introduced. IBM keeps repackaging, further confusing me and probably everything else.
There should be a marketing effort to get just Domino as a secure development platform for Web. It can be as sophisticated an interface as you want it to be, and it had multilanguage development long before .Net.
Just the full text indexing with instant, delayed, or on-demand reindexing is worth the price of admission. Have you ever tried to find anything on the MS site?