These are generally the preferred means to talk about or ask questions about UML. There are two of them, uml-user (user-mode-linux-user (at) lists.sourceforge.net - subscription info) and uml-devel (user-mode-linux-devel (at) lists.sourceforge.net - subscription info). The difference between them is what you'd expect. uml-user is for people who are trying to make this darned thing do what you want and for those who are trying to help. uml-devel is more for discussion of the code. I post announcements of new patches and CVS updates to uml-devel, and announcements of full releases to uml-user.

Send bug reports to either list, whichever is more convenient.