Timetracking: slimtimer.com.
This is one of the best time trackers I've seen (and I've seen many)
Mercurial code hosting: list available here.
I've only used the service provided by sourceforge.net and was satisfied with it.
Web conferencing, desktop and whiteboard sharing: Dimdim.
I haven't had much luck with it, but I believe it might perform much better on a Windows machine.
All sorts of version control, wiki, RSS feeds: sourceforge.net.
It's only for FOSS projects, though, but it really ofers a lot of services.
Other than that, basecamp should fit right in an agile process (although I haven't used it much) with a reasonable price ($50/month...)
