DVD newbie questions - please answer



I am totaly new to dvd burning, but I have been burning CDs for a long time now.

I dont know the diffrence between the type 1, type 2 dvds
I also have no idea what the diffrence between the DVD-R & DVD+R is. I am looking to buy a cheap dvd burner off ebay(its only for occasional use) I have seen that the Panasonic 4.7/9.4GB Rewritable very cheap but I have no idea what is better than what

the Philips DVD+RW/CD-RW looks better but is more expensive , I also have been looking at this drive http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?MfcISAPICommand=ViewItem&item=2028945721

some one please help me!


Also what is the deal with having disc and or cartridges (pro, con to each?)