The Ludum Dare website doesn't give you a great way to get notified of comments on your game. So I hacked together a bookmarklet to generate that RSS feed. To use it:
1. Drag this link to your bookmarks toolbar: LD Game Comments RSS.
2. When viewing a Ludum Dare entry page, click that bookmark.
3. If you are using Firefox, then this part is pretty slick and it's obvious what to do! If not, Just ignore what you see, copy the address from the address bar, and paste that into your RSS reader of choice.