I added a Quick Search to Firefox today and thought I'd share it. Just create a new bookmark, set the location to the following code snippet (removing any line-breaks your browser added):
javascript:x=new String(%s+'a');while(x.length<5){x=newString('0'+x)};x=x.substring(0,x.length-1);document.location.href='http://www.python.org/dev/peps/pep-'+x+'/'
And set the keyword to pep. Now you can type
pep <pep-number>in your location bar to be taken to the corresponding Python Enhancement Proposal.
Fun, eh?