I've noticed a huge increase in network hashrate. It is now 600x my own hashrate, while it was still 300x two days ago.
The client sometimes reports garbage, take a look at these graphs, they're averaged over 144 blocks (10 blocks for 24h graphs).
Network hashrate actually decreased on the 29th due to the Nfactor change.
http://yacexplorer.tk/graphs.htm