Tangible & Digital goods - can I offer Digital as "pay what you want"?

Greetings - - I'll be offering both tangible and digital products. The digital products I would like to offer as "donationware" - download it and pay what you want, if you want.

Will use only PayPal checkout;
Will this work in the checkout form?
Would I have to offer attributes? [set initial price to $0.00 and attributes for $1, $5, $10, etc.]
Any other thoughts and/or comments are very welcome.

Another question - different topic - I found the auction mod for Zen - - anybody know if it's used much or should I just use phpAuction in a different directory?

Lastly, (sorry for the total salad bar of subjects LOL), suggestions on forum board to use?

Thank you very much - I did search most of this but didn't really get any strong answers.

Appreciate all the community support
Ron