I'd like to specify a Twitter list to search for a specified hash tag.
Searching by a hash tag is easy: http://search.twitter.com/search?q=%23geocamsu will search all of Twitter for the #geocamsu hash tag. I'd like to limit that search to a particular list but do not see an option for doing so on their advanced search page.
Is there something I'm missing that allows for specifying a list?
Twitter doesn't let you search within a list with it's search function. But you can achieve it the other way around. You can fetch all the statuses from a list in some interval, preferably using the since_id parameter, and search in those tweets. It's kind of hectic way, but the only way right now.