I am currently evaluating phpED, and the debugger of the version I have downloaded does not support the latest PHP version (5.1.2 at the time of this writing), which makes me wonder: how long is the typical delay between PHP's upgrades and the corresponding DBG upgrade? I am talking about the version bundled with phpED, not the free version.

Thanks in advance

Actually it takes a few days to release debugger corresponding to the latest version of php.
Regarding 5.1.2 I think no updates are required because it works with debugger intended for 5.1.1.
Let know if you get any problems