My girlfriend is subscribed to a dozen or so cooking/food blogs (using Google Reader). She stars recipes she's interested in, but since there are so many that catch her eye, she now has over one hundred starred items. Finding a recipe from several months ago among them is not easy, since Reader does not support search (yes, we know).
Since these starred items are shared (so my mom can read them too), I thought that I could use Reader's JSON output to allow at least a primitive type of searching. The result is this filtering UI. You can either plug in a public label name (of the form
user/user ID/label/label name) or a feed URL and a search term, and all items with titles containing the term will be displayed.
This hack uses the continuation token that Reader provides, so that more than one chunk of items can be fetched.