Most of you have hopefully managed to get patched up to 3.0.2 by now, and fortunately it seems like the servers are stable enough that we can often get some playtime in (with last night being an exception, at least for my realm). If you have installed the patches, I have a word of advice from you, straight from Eyonix: Do not delete your 3.0.x patch files. You will need them when you install Wrath of the Lich King.
The reason for this is that the Wrath DVDs, having gone gold a week ago, contains an installer for patch 3.0.1, so after installing the Wrath client, you'll have to patch back up to 3.0.2 (will almost certainly be at least 3.0.3 by then, actually). So if you delete your patches now, you'll just have to re-download them on November 13th, and it's a good bet that that will not be a pleasant experience. Save your patches!