Possibly the most powerful channel that's available on IFTTT is the "Feed". Any RSS feed URL can be used as a trigger. This means that I can now consider leaving networkedblogs, on which I currently rely to syndicate new blog entry notices to Facebook and Twitter. I'd also like to review all my feed subscriptions, and see what else I'd like to automate.
Thinking along those lines, I especially appreciate that many of the channels have filterable action triggers, such as keyword or hashtag values that one can specify. That way, I could ensure that I always see new content about certain topics from specific channels, be they in the form of public bookmarks on Delicious or results from Twitter searches.
I just need to take the time to set it up. Preliminary testing has proven that it works well. However, not every available "recipe" (crowd-sourced configurations that anyone can activate for themselves) is a good idea: case in point, the service is not smart enough to discern whether a tweet is spam or not, so thanking everyone who @mentions you, while tempting to implement, could inadvertently help reward spammers.