And I've been correcting some of the ones I'd deemed uncorrectable in iPhoto '06. While iPhoto '06 did have some rudimentary levels correction and some hack and slash brightness/contrast (I know better than to use those), so any images that needed real work needed the work to be done in Photoshop.
I do have Photoshop (CS), which means I can't fix some of the lens distortion in buildings (that came in CS2), but obviously its color correction abilities far surpassed iPhoto '06.
'08 still does not have curves, but it has a highlight/shadows correction, much more responsive levels sliders (that could be the much more powerful CPU, too, to be honest) and better color correction.
The result is that some images that I thought were beyond fixing are actually looking...okay. Many of the skies are still blown-out messes (to correct them enough with the highlight/shadows command would make the rest of the image look ridiculous) but a lot of the dusk and early evening shots are looking much better, and, obviously, tweaking the black levels of the pictures shot with the point and shoot (versus the Rebel) makes them look much better.
At some point, when I'm done, I'll take down the Picasa Album as it exists now and re-upload the newly-minted 5 star images. (There are so many 4 star ones now, it'd break the account if I uploaded them.)