Easiest/Most Expensive way: Buy an apple tv (ATV), and with airplay to stream whatever is on the touch's screen to your tv using the ATV
--This is what I do an its pretty cool. You can also stream other apple products as well (iPads, MacBook Pro, iMac, iPhone) but it costs like 89 or 99 bucks.
Cheaper/Uglier way: Buy some av cables that use the sync port to output video on to the tv
--This is of course limiting you to the length of the dongle you buy, but you can find some for as cheap as 6 bucks.
You should definitely figure out which generation you do have though because some of the newer iPods won't work with older connectors, even within the 30-pin connector generations, unless you jailbreak it of course.