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Ben and Ricardo -
Have you guys done the "take a small aperture pic of the sky" test to check for dust. I was sorta horrified how much dust had accumulated using the blower method of cleaning. It only really shows up when I'm trying for high-DOF and include a solid color object (such as the sky), but as I've been shooting more landscapes that has become more of a problem.
If you haven't explicitly gone looking for dust, then my advice is... don't. Better you don't know. If you test for dust and don't find much (fewer than 5 large dust spots, and 20 odd small spots), then I'm both pleased and a bit jealous. If you do the test and see the dust the Eclipse and Sensor Swab solution (as detailed here: http://www.pbase.com/copperhill/ccd_cleaning) seems to be the only practical way to remove it. I tried it for the first time on Friday and it worked exactly as advertised!
Here's a before and after (sorry it's not a shot of the same thing, I also took pictures of a wall in both cases, and you can see the dust, but one is quite blurry... user-error):
Shot of my computer screen (auto-levels) showing dust immediately post-blower cleaning:
Shot of the sky (auto-levels) showing dust (what there is of it) post-cleaning: