Pretty simple idea I hope--instead of the $20, 40 or 100 one time donation models, add a recurring model--I think Paypal supports this kind of thing. From my perspective, it's a lot easier to float a $1.99 or 2.99 a month kind of thing on the bank or CC statements past the wifey than a $40 donation.
"What is this $40 for? WHAT IS IT FOR?"
"Well, it's for this nerdy site filled with geeks honey....erm, they help me come up with ideas to spend all our money on all those fans and heatsinks piled up in the spare bedroom..."
So anyways...maybe 1.99/mo? Wait, scratch that...make it *drum-roll* $2.00/mo!!! That would be $24/yr....and even getting just 20 people doing that would make a pretty good dent in the webhosting costs I think. Maybe there could even be pictures attached to the forums
Edit: I in no way mean to disrespect the dweebs and dorks out there who weren't mentioned above. You also help me waste my money (I would be a card-carrying geek, btw