Looking at http://www.dpreview.com/reviews/sigmasd10/page9.asp the hi-res SD10 files are about 8MB.

The jpegs (on the highest setting) that my Canon 10D produces are typically less than 2.5MB, the RAW file sizes on the Canon are lower as well, at around 7MB (though that has a hi-res jpeg embedded in it as well, so the actual RAW data is more like 4MB and if you choose to have a lower quality jpeg embedded the file is smaller).
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Remind me to change my signature to something more interesting someday