AJ Muni:
Right that one is.
Where to buy them:
miniDVI to DVI from apple at the apple store, best buy, circuit city, amazon, etc... aroung $20.
The DVI to HDMI adapter I bought mine form Radio Shack, also you can get them in any video store, amazon. Also you can use a DVI to HDMI cable. By checking your link those Xtreme Mac cables also seem to have a good price.
det2004:
When I connected my MB to my Sony LCD TV it worked fine, my suggestion to you is to check if your Mac is recognizing the TV, check if it shows all the TV details on your System Preferences and check which is the best setting to use it like the refresh rate and all that.
Before buying my Sony LCD 40" I had a small 14" regular TV and I used the RCA video input with the same adapter you are using and it also worked fine, chekc if you have the same issue with the RCA port.
One thing about some Sony LCDs when playing old recorded media is that they don't reproduce very well and show some lines during due to a refresh rate issue, that is a known issue from some Sony LCD TVs, mine is an XBR2 and has that condition, but I don't care too much about it because 100% of what I watch looks fine.