partstrain.com is listed on OB.
They show up in sponsor links on a discussion list for Amnesty International members (a list hosted by mainsleaze spammers Topica...).
They seem to be a legit autoparts company. I can't find any abuse reports on NANAS that mention partstrain.com, but one news group post indicating they might be a bit shady.
Not sure about this one. I'll whitelist it locally if there is a reason for it being on OB.
Patrik