Recently Scott Ambler and the people from agilemodeling have opened a wiki called OpenUML. Their aim is to gather ideas to define usefull extensions or limitations to UML or define DSL's to enable modelling better than UML facilitates at the moment.
Let's hope our wiki will have some ideas about that aswell. Which remainds me I should not only write blog entries.
Hmmm, I'll write my 500 lines; "All blog and no wiki makes MTF a dull site"