In a paper published in Science and commented on Naturenews Vivian Cheung and coworkers described how they found 10000 locations where RNA is different from what you would expect from the DNA sequence. The Naturenews comment mentions that other scientists have seen the same phenomenon. Did any of you observe that (or are you able to check?). Since a lot of people here should have related DNA and RNA sequences we might be able to do a kind of community project. For instance checking whether the phenomenon occurs in multiple species.
BTW there is an interesting comment that indicates that it the phenomenon might have other causes than RNA editing on the "Genomes Unzipped" site here.
EDIT October 11, 2011
Evidence is now starting to get published that it is just not true. See http://www.plosone.org/article/info:doi%2F10.1371%2Fjournal.pone.0025842. An interestung comment can be found here: http://www.genomesunzipped.org/2011/10/revisiting-rna-dna-sequence-differences.php. However, I still think we could have done an interesting community project here.