A short article giving an overview of 3 usability testing sites that offer free services. All can be upgraded at a cost. I've played with 5 Second Test before, but not come across Usabilla or UserPlus.
Needless to say I'll be giving them all a whirl as soon as the opportunity arises.
If you've any experience of any of these, please leave a comment. Be good to hear what folk think.
Free tools for usability testing - article by Marisa Peacock for cmswire.com