Me, I just let my trusty PSP 6 do the "smart size" thing and not worry about which method... But sometimes the process softens up things a bit. So I add a touch of sharpening after the image is made smaller. Other than that, I like adding my name to the thumb and/or some goofy visual effect... I suppose it's to make the person wandering the pages curious as to what the pic is exactly. Regardless of how you make 'em, thumbnail images usually help; it seems the pictures with 'em get more views.

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Barbequed Pixels?

Your friendly neighborhood Wings3D nut.
Also feel free to browse my freebies at ShareCG.
There might be something worth downloading.