In addition to the previous Search Once and Subscribe: Making Meaning of RSS, there is a cool tool to use so you'll know who and when one of your tweets gets Favorited or ReTweeted.
The tool is Favstar.fm and it's a multi-purpose cool! You can find new Twitter connections, follow hot topics (by number of stars and shares), and you can search once and subscribe to the activity on your own tweets.
Below is a video tutorial on how to best use Favstar, and note that to subscribe to your activity, the "recent" tab on your favstar account has the RSS feed you seek (how do I subscribe to a search feed?).