There is a perm root solution for those who lost root by taking the OTA. The solution was available literally a few hours after the OTA dropped. Hatcha already posted the xda link in his post. It's a little long winded, but it works.
I've also posted my solution in that xda thread. Your phone remains unlocked after the OTA. Since you already took the OTA you don;t have to RUU back to stock. You can go directly to installing Amon Ra custom recovery using Scott's CleanFlash program found here:
[TOOL] - 12/29 - CleanFLASH 1.0 - Flash boot / recovery.img easily! - xda-developers
After that you can push SU and superuser using the option under the developers menu in Amon Ra. Then reinstall the superuser app from the market and you will have perm root again.
OR you can simply flash Amon Ra then install any of the rooted OTA stock roms that are already availble on xda. Here's one of them:
[ROM] Stock Rooted OTA ROM w/ Firmware - xda-developers
Like I said, these solutions have been available for two days now. Maybe it's not as easy as one-click and maybe flashing a rom will require you to reset-up your phone. But honestly, if you really can't live without root, then spending the time to root the new OTA (and re-setup your phone if necessary) should be more than worth the trouble.