Kim,
You can probably find that article on dpreview somewhere.
For the hobbyist who does snapshots, will never blow up beyond 8x10, 4 or 5 megapixels is fine. I borderline on advanced amateur and I frequently shoot with a 4 megapixel Canon G2 that's 3 years old and it's acceptable to me.
If you were shooting in RAW (a professional level type of image) you'd want more megapixels.
