My 2 cents about the paypal thing. Personally I PREFER paypal when I purchase things on ebay, or the AT forums, or stuff like that. In either case, buying or selling.
In terms of selling, if you use thier debit card, you can get 1.5% charges as a seller. If you run a serious buisness you can set up ways with paypal to get it around 1% or less I think, without the debit card (this is from memory, I can look up the specifics if anyone cares). Last I heard, to have a merchant account with credit cards they can charge you anywhere from 2%-5% or more depending on your volume. Also paypal is VERY conveniant and its very easy to see when/if someone has paid you. Its also VERY fast. The money shows up in paypal within 5 seconds or so.
In terms of buying, I like the idea of paypal being a one use thing, and also more anonymous. I'm not giving out my credit card # to someone on ebay who could do who knows what with it. Also, no one can do recurring billing without your knowledge, so when you pay with paypal thats it, one time payment unless you personally choose to pay more.
There are a few disadvantages to paypal, namely the lack of federal laws protecting you from fraud as a buyer. However, I have never gotten cheated yet when I buy things off of ebay (mainly because I'm careful to research and actually READ feedback and email them, etc etc), so I haven't been too worried about this.
BTW, I mentioned I use a paypal debit card, that's my ONLY debit card, in general I advise steering far away from debit cards, less protection than credit cards.
Just my 2 cents. What do you guys think about it?