I've got a few filters setup on my local mail client to look for:
X-RBL-Warning WEIGHT20
Currently I'm catching a lot of spam but I'm also seeing some things (like the occasional email from this list) get caught as well.
Note that if you have a mail client filter set to catch "X-RBL-Warning", you will catch any E-mail that fails any test that you have set to use the WARN action. Often, legitimate E-mail will fail one or more spam tests (such as SPAMHEADERS). However, very few E-mails should fail the WEIGHT20 test -- so it may be best just to check for WEIGHT20.
Hopefully, others will answer some of your other questions.
-Scott
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