Recently I purchased a Philips 37" LCD television (model 37PF7320/79) which is capable of 1360x768 pixel resolution. Unfortunately XFree/Xorg does not recognise this resolution so you must provide the XFree/Xorg configuration file with a working modeline. After quite a bit of tweaking I finally have this working setup for the television via a DVI to HDMI converter cable (put in xorg.conf):
Section "Monitor"
Identifier "Monitor0"
VendorName "Philips"
ModelName "37PF7320 LCD HDTV"
HorizSync 30.0-70.0
VertRefresh 50-60
Option "UseEdidDpi" "FALSE"
DisplaySize 345 195
Modeline "1360x768" 84.750 1365 1384 1516 1792 768 786 792 798 -HSync +Vsync
EndSection
Note: DisplaySize and UseEdidDpi settings force the X-server into 100dpi mode otherwise MythTV has display issues (fonts are too small) as outlined in the MythTV Wiki.
And in section "Screen" of the configuration file add 1360x768 as an available resolution to the relevant colour depth you are using. Restart X and in theory you should end up with a nice, sharp, widescreen display on the television that looks a lot better than the default stretched 1024x768.