OK, I'm placing a tip jar on the right hand sidebar (it is slightly wider than the column, making it a little ugly, but this was the easiest and smallest widget I could find, sorry.)
It uses Google Checkout, which allowed me to be somewhat more anonymous than PayPal or GPal. For existing users of Google Checkout, it is very easy to choose an amount to donate, click and it is done. Otherwise, you would have to sign up for that service (I think.)
I have not tested it thoroughly, but if anyone wants to throw me a buck or two, it would be very much appreciated.
Meanwhile, I got rid of the sidebar ads.
I'll try to keep the begging to a minimum!
Thanks so much for all the compliments in the previous post's comments. I do appreciate it.
UPDATE: I fixed the "out of stock" problem.