I use FeedBurner for RSS feeds. There are three of them:
First one is used on this website and some planet sites (Planet LinuxToGo, Planet Closed fist), second on Planet OpenMoko and last one on Planet Maemo. And I do not care about comments feed.
With default “Meta” widget link to WP feed was shown and also link to comments feed. My plugin removes both of them. Additionally link to WordPress homepage is replaced with link to WordPress MU website if it is used.
Download plugin.
License: same as WordPress (as it is WP code mostly).