TwitterFeed is a really cool service. Using Twitter feed you can push any RSS feed to Twitter, which enables a super simple way to push pretty much any kind of syndicated data to Twitter (and now Facebook, Laconica, and HelloTxt).
I also use del.icio.us to save interesting bookmarks in a easily accessable persistent location.
The problem was several fold:
Twitter is a great way to talk about things (including links)
Twitter isn't so great at categorizing links and making them easy to find later
I wanted to save links on del.icio.us but share them on Twitter
Not everything I shared on del.icio.us was something I wanted to spam my Twitter followers with.
Turns out the solution is pretty simple. On del.icio.us you can create tags. These tags help oranize bookmarks.
For each tag you can get an RSS feed (see where this is going?). RSS feeds for tags look like this:
http://feeds.delicious.com/v2/rss/<username>/<tag-name>
You can also visit the tag's webpage and select the RSS feed button next to the URL bar (then record new link in the URL bar):
I selected the tag name tweet-this for this set-up.
The next step is to visit TwitterFeed and get set-up with an account. Once you've got your account you'll be at a Feed Dashboard, select Create a New Feed and enter the previously recorded URL:
Select test rss feed to make sure everything is working.
The rest is point and shoot with the TwitterFeed set-up process. Now, only bookmarks recorded on del.icio.us with the tweet-this tag will show up on Twitter.