I haven't decided if I'm one for staying here yet...
But I surely do miss an option to downrate/block posters.
The iPhone app marketplace has a lot of SPL meters, but most are apparently terrible. I wasn't willing to spend $20 for the best one, but the 0.99 SPL Meter from Studio Six Digital is pretty nice, has a max value, and rotates upside down. The free Volume Tester doesn't rotate but otherwise is nice - you can reset and stop/start measuring, and it has peak hold.
Uncalibrated may make different phones have different readings, but before and after readings over the same drive should be consistent.