I don't think Mediatomb is a complete solution to live TV on maemo (unless you already use VDR). Not me, so, if you use a HDHOMERUN, like me, it is simple to just use VLC (see: http://wiki.maemo.org/Vlc#On_your_N8...ettings.2Fapps) to transcode and stream to the n8*0. The HDHomeRun Config utility can tune to a channel and spit it out to VLC. On my Macbook, VLC actually offers you an EyeTV plugin that allows you to select channels within VLC. Set VLC's profile (see article) to transcode and stream to the n8*0 on mplayer/kmplayer. As an added bonus, VLC and HDHomerun are completely cross platform - Win, Mac and Linux (and I suppose any other Unix flavor.
The quality is, however, very cpu/platform dependent, I find that my 3 year old 2.0 Ghz Core 2 duoMacBook struggles with quality (transcoding?) while my newer Quad core Phenom I (supposedly a dawg) running Vista transcodes and streams rock solid with with high picture quality. I haven't yet successfully tried out either of my Ubuntu boxes (Atom 330 and Core 2 Duo) but I have been working on the headless server. Well, if Windows does only one thing well, it is multimedia.