Blog Signature Generator allows you to create a dynamically updating news banner (signature) that links to the original feed source. It also generates a Gravatar connected to your email address – "an 80×80 pixel avatar image that follows you from weblog to weblog appearing beside your name when you comment on gravatar enabled sites."
Mash and Grab RSS Feeds
You can find a good selection of RSS feeds via the Mediaspheres Grazr – Right click on any list title to grab the feed (copy shortcut).
You can also grab a selection of pre-mashed RSS feeds via Dave’s FeedRaider. Each single-page aggregator has RSS, OPML and Embed options at the bottom of the page.
The FeedRaider RSS feeds can be pasted into the Grazr address field (open View on menu, choose Address Bar), then select the refresh icon on the right of the browser to view the combined feed mashup.