Look! I'm not the only crazy person who likes Peter! Here are a few of the sites I've come across in my travels on the web. I hope they help you gain an appreciation for the great character (if not sterling example of morality ^^) that Peter is.
Wormtail's Mini Shrine
A honest to god shrine to Peter! And for the record, this page predates mine ^_^
IPPL Clique Site
I clique for those of you sick of seeing Peter mistreated in MWPP fics.
Society for the Ethical Treatment of Peter Pettigrew
A page/clique for those of you sick of seeing Peter mistreated in fanfics set in any era!
Rat's Tale
The mother of all Peter slash fanfiction! Lots of really good fanfics there.
Wormtail's Harry Potter Guide
Well nothing is really here yet, but I'll put a link up in case soething develops.
Obsessed Lists
Obession signs pertained to various characters, including Wormtail(and Peter further on down) and they're actually serious signs, not sarcastic ones!
Nasubionna's HP Tribute Page
She has some really good character information on Peter in her character section, plus, I just like the page a lot =P
The FAP Peter Debate Anakin's Peter Rants Other Peter Fans(yes, others do exist!)