What I meant was not that the number of Gigahashes seems to have gone down (this is obviously the case). There seems to be something that happened two days after the crash. Before the crash I got about 19 Bitcoins per day. On the day of the crash I got 0. Then on day 1 after I got 17, and the day after I got only 8. So I was wondering if something happened on day two also.
The mining difficulty went up across the network at 05/09/11 @ 4:17:24pm EST (the same day slush happened to restore the pool). You might have noticed a drop in bitcoins generated because of that. See
https://en.bitcoin.it/wiki/Difficulty