I also included this idea after seeing it on a couple of sites, which led me to try a little experimentation..
At first I used a set amount of $3.00 which didn't get any submissions, this was then changed to $1 which gained one submission (of which 40 cents was taken by Paypal haha).
So I recently changed the button to allow the user to select an amount which has resulted in a couple of kind donations of $3.00 and $5.00
These tests were pretty vague as I didn't take any notice of the time periods, but I think allowing the user to select an amount is the best option.
Another point to note is the code Paypal supplies is not valid, but this can be ammended by adding <fieldset> tags and following the hints from the W3C validation page.
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