Hey Dan, I see you didn't get many responses here.
We don't offer custom development, but was wondering if you took a look through the WP.org repository because there are a number widgets available and may only need minor tweaks to get what you need. Sorry I can't link, apparently not made enough posts yet. :-(
Failing that you might wish to use some kind of freelance site to get ya self a developer for this job.
Last edited by WPMUDev; 03-30-2012 at 11:20 PM.
Reason: not enough posts addition.