Issues with possible duplicate indices on table

[Doug Livesey]

Hi -- I was wondering if I could ask the community for a sanity check on the indices on a table we have with around 750,000 records in it.
The show keys output for it is here: https://gist.github.com/1447223
To me, it looks like there's a double index on id, which must be slowing things up, and there are things that don't look right about other indices there, too.
Unfortunately, I'm far from an expert (although I'm somewhere on the road there, hopefully ;)), so thought I'd post the indices here, in the hope that a DB guru might be able to point me more accurately at where they may be a problem.
Thanks for any & all help,
Doug.