The only one I've come across is Hrefer that comes with xrumer. All the others I've seen don't let you use proxies. And proxies are key for cheking thousands of sites.
This is the fastest pr checker I see and with no captchas http://naaki.com/pagerank For single one http://www.naaki.com/bulk-pagerank For bulk
I believe I tried 90% of the links on here and they don't work. Even the ones which appear to work don't. I verified this by cross-checking the results they output with an actual reliable checker (going through links one by one) and they don't work. Point is, fish for the new ones. The thread is like 3 years old. Just gotta spend some time Googlin' or start a new thread
Check out my bulk pr tool at: http://www.massivepageranktool.com/ Code (markup): It uses proxies, can check unlimited domains and can use up to 15 simultaneous connections. Oh and...its really damn fast. In the video bellow, i used Massive Pagerank Tool to check 1000 domains in just 1 minute. [video=youtube;4EzIMi_kQbw]http://www.youtube.com/watch?v=4EzIMi_kQbw[/video]