What is the best way to monitor/notify myself of new Craigslist listings for housing? [more inside]
How would I filter out a single user's images from a Flickr pool's feed? [more inside]
Can I filter out previously posted URIs from a delicious RSS feed for a specific tag? [more inside]
I would like to take a given RSS feed (e.g. MetaFilter's feed), and create a derivative feed containing only the items with YouTube links in the content, with the destination URLs changed to the YouTube links (rather than the source of those links). Does something like this already exist? If not, what's the simplest way to create it? I can write code if necessary, but would rather not if there's an alternative. [more inside]
Do you know of a server-side script for combining RSS feeds, removing duplicates, filtering out items that match keywords, and then generating a new RSS feed as a result? [more inside]
Is there a free service online that will allow me to aggregate RSS feeds, but will only show the last entry from each blog? (more details below) [more inside]
Does anyone know of a free service like Google News alerts, only for Usenet? Filtering in newsreaders won't do: I need alerts from across all available groups; I can't very well subscribe to 40,000 newsgroups and then filter on the client side. If the results came in RSS form, that would be fine, too. Right now, my best option seems to be to save searches at Google Groups to a browser bookmark group.