Some of AdSense publishers are not getting payment of 1st May 2010 to 31st May 2010 due to problem of crack with google AdSense account. Google Employee Chris admitted this issue and replied
For these publishers, the account balance in the "Payment History" page (which you can access under the "My Account" tab) may be incorrect when viewed as "Last 3 months" only. The workaround for this issue is simple -- just check your balance in the "All time" view instead. See below for detailed instruction on how to do this.I hope soon the problem will solve and payment will be issued to blogger and website owners who are doing work under AdSense programme.
Just to reiterate, this is only a display issue, and your actual earnings are not affected. Our engineers are aware of the issue and are working to fix it, though I understand it is a particularly difficult nut to crack so I can't say now how quickly it will be resolved.
Lastly, keep in mind that we don't issue payments the moment you hit the threshold -- check out this payments guide for info about when to expect your payment: https://www.google.com/adsense/support/bin/answer.py?hl=en&answer=21591#3
Apologies for the confusion, and thanks for your patience while we resolve this issue.