Simple check if current is broken

Hello there!
I sometimes see in this list such mails:
"I got problem with rXXXXXX"
"It's known, it's fixed in rYYYYYY".

Sometimes it's my problem, sometimes it's problem of other peoples.

How about make simple web-service where revision numbers could be "marked"
as bwoken, with minimal info - like next working rev?

Can we make small sub-task while buildworld/buildkernel going, to simply
fetch info about current rev and if it's broken warn user?

This probably would improve user experience for those who use current, but
have no time/proficiency to read commit logs.

Thanks.

-- 
Regards,
Alexander Yerenkow