jobs@startup_you_want_to_work_for.com
In my experience, pretty much every start up is hiring provided you're qualified and passionate enough. By their very nature, start ups can't possibly list things like expected salary or equity because those heavily dependent on what you yourself bring to the table. If you'd like a place to start when looking for start ups you'd be interested in, http://www.crunchbase.com/companies might be a good place to start.
In the words of Paul Bucheit (from his talk at Startup School 08), "I've never really had any problems figuring out what to do with more really great people... because they can usually just take care of themselves."