@Eric Adler Totally agree that IA is incredibily important for a positive user experience. As this is so important companies know that most times companies will pay through the nose for it and sometimes that is a tough sell to the people that pay the bills =)!
Having said that, I have been lucky to work with clients who paid for Optimal Sort which is the best tool in my opinion. But I have also had clients who did not want to foot the bill. So ...
If you can do them in person and have access to a Mac, I would recommend xSort as its free and has analytics built in.
If you have to do it remote, I would suggest using something like Trello. You have to do the analytics manually but it would cost you nothing. Here is an article to get you started.
But if you can afford $25 for a month (for most projects that's enough for 1 test) you could get Proven by Users or Usabilitest. That $25 is money well spent just for the reports!
Anyways ... good and keep fighting the UX fight!
