Web tools for scheduling a meeting

I’ve used http://doodle.com a few times to quickly arrange meetings, but now I’m running into some limits and am looking for alternatives. I’ll list my comments as I find them. Please add if you know any. 
 
 http://doodle.com – Free, and very easy to set up and use. Doesn’t require login or $$ but right now I need something that isn’t tied to specific dates. I want to know generally, which days are are available. 
 
 http://www.jifflenow.com/ – apparently synchs with your schedule. 
 http://scheduleonce.com 
 http://www.diarised.com/ 
 http://whenisgood.net/ 
 http://www.pointment.com/ 
 http://www.presdo.com/ 
 A lifehacker post about diarised has links to other lifehacker posts about whenisgood, pointment, presdo and the already mentioned doodle.