Second Life total signups is back on the air. The feed lit up again on 4 May. The weekly signup chart will come back online as soon as there's enough data. The figure presently reads 15,348,641. Pre-purge that was 16,753,668. How many accounts were purged is unknown, but shouldn't be hard to estimate with some reasonable accuracy.
Not so good news:
Linden Lab is only providing updated concurrency data twice per hour. Once at 5 minutes past the hour, and again five minutes after that (ten minutes past the hour). Then nothing for another 45 minutes. That means the 30-minute deltas are pretty useless. There's not enough data to chew on.
Technology is awesome.
Anyway, right now you'll see a lot fewer red sections in the charts. There have been a few internal structural changes as well, but they likely won't affect chart viewers in any significant way (except to save you a little bandwidth).