Arno Moonen

This plug-in makes it possible to exclude certain parts of your posts in your feeds. 
It uses the filterhooks <code>the_content</code> (in combination with <code>is_feed()</code>) and <code>the_content_rss</code>.
You have several options to determine what must be excluded; you can hide everything after the More-tag and/or hide everything between <code></code> and <code></code> 
Since update 1.1 you may use multiple CRSS-tags in a post.

CompactRSS

Gives you the possibility to exclude certain parts of your posts automatically from the RSS feed.

roya khosravi

Allows you to create a dynamic Google gadget for your WordPress Blog. People can add your gadget to iGoogle or to their other pages across the web. When users add your gadget to their iGoogle homepage, they’ll see your content each time they visit Google. Your Google gadget will show your latest posts sorted by date and an avatar image (your Gravatar).
Version 1.1 : max number of displayed posts is set to 20.
Version 1.2 : add screenshot (gravatar), thumbnail (gravatar) and scrolling to your iGoogle gadget.
Version 1.3 : allow your visitors to add your gadget to their webpages.
More About WP-iGoogle Plugin :
http://www.royakhosravi.com/?p=477

WP-iGoogle

Create a dynamic Google gadget for your WordPress blog. Allow People to add your gadget to iGoogle.

CompactRSS vs WP-iGoogle