Have you ever tried reading the XKCD feed on a mobile browser like Android Browser or Mobile Safari? Doesn’t it annoy you that you can’t read the comics’ title text (the additional joke that pops up when you hover the mouse cursor over the comic in a desktop browser)? Try the improved XKCD feed, which uses Yahoo! Pipes to put that text in a more readable format. It also provides links to comic explanations and XKCD forum threads if you’re into that kind of thing.
Similarly, are you bothered by having to click through to read Cyanide and Happiness instead of reading it right in your feed reader? Enter A Better Cyanide & Happiness Feed, another Pipes feed, which embeds the comics in the feed.
My life has been improved immeasurably by these feeds.