I've tested the crap out of ReverseDOS 2.8 in my testing environment. It's working out perfectly. The new redesign makes it tons easier to manage. There's also the ability to 'trust' certain IP addresses as well from withing the .config file - so you don't have to worry about ReverseDOS-ing yourself when you post to your blog and such...

Performance has also seen a serious boost. For all intents and purposes, filtering is free. I've run some perf tests with and without rdos 'installed' and the results are quite favorable.

Without ReverseDOS configured or hooked into the pipeline:
Average: 191.2 pages/second

With ReverseDOS configured and scouring for comment/referrer/etc. spam:
Average 190.6 pages/second

I'll run some more tests later... but at present it's looking well within tolerances.

Now I'll just run version 2.8 on AngryPets.com for a few days and then pour over the logs to see if I spot anything amiss. (I shouldn't.)