Is it acceptable to put a link in my signature line that goes to a donation page? I'm a Roadie for AIDS LifeCycle in June, and it would be nice to get the word out on the org.

Ive had links to several of my own websites/businesses in my sig over the years and never had anyone tell me otherwise. It used to be a good way of increasing the page rank of your site with Google. I think Google have changed the rules now though. But I say go for it, put the link in your sig. So long as it doesnt break site rules, ie a link to bootleg sites, you should be fine. And as long as you are involved in the conversation and not just pushing your link out there for the sake of it, I dont see why anyone would have issues with it.

Sounds like a great idea to me. Good luck with the fundraising.