Our company is currently in development of software, which should help software developers better support their products. Currently we are still in development but are planing to get into private beta in spring of 2010. I have looked at a couple private betas and am trying to find more which are more like my kind of service. When signing up every company gets their own subdomain a lot like fogbugz.
Which sites have you found to have a cool private beta signup method? Or looked cool?
Some examples I have looked at: