This is looking pretty good! Thanks!
I notice that a lot of the webpages that search CL are being blocked by craigslist ( http://www.craigslittlebuddy.com/, http://www.crgslst.com/ to name two high-google-ranked ones). In some cases, the search engine page requests that you disable 'references' in the browser ( http://crazedlist.org/ ).
Craigshelper does not request this, though, and I wonder if they're on the list to get blocked soon.

As for disabling referrers, I've installed a FF extension called 'RefControl', which can configure the sent reference on a per-site basis.

Am I right in thinking that a software-based search solution (by this I mean it's on *my* machine, not the internet) would avoid referrer issues?

edit:
Ah! craigshelper will not be blocked because it isn't doing the search work! First FAQ: http://www.craigshelper.com/faq.php

An aside: I also just learned that to open a link in a new tab I can just click with the wheel button. All this time I've been right-clicking and selecting 'open in new tab' from the menu.