I've been using IPS (aka IProfessional.com) for a couple years now, and couldn't be happier with them. If you want to join them, the miminum billing rate is $60/hour, and depending on your rate, their take is as low as 3.5% (I think that is for anything over $85 and hour, but you should double check), and they have a max of $4500 a year (in case you have a good year).

 

One upside of IPS over the others (besides the fact that the owner, Michael O'Connor, invented this business format back in 1986), is that I got them added to the Microsoft Vendor list.  So, if you can get some business out of Microsoft, the usual barrier to entry (getting someone within Microsoft to get your company on the vendor list) has been eliminated.

 

Don Demsak