If you are using the svideo input and are using a pre-3.05 version, all I can say is upgrade today, now, run...
The picture quality is great.
And you get to fiddle with a values live (in my case in the lounge with a laptop, staying within palmod_config and seeing the changes on the TV screen)
A great thanks to Thomson for his great work.
PS: My current values for Sky on svideo are as follows
(I'm still tweaking, it might still be a bit bright)
avbrightness=109
avcontrast=73
avsaturation=51
luminanceDelay=0
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