Jim, and others,
I spent more time with Picassa and MC side by side with a large photo collection (5000 images) and have a couple of observations.
1) picassa just looks a lot better. It looks like a more modern application. The photo area has a light grey background and all of the thumbnails are displayed with a drop shadow. This makes it look much more modern. MC *feels* 3-4 years old on the user interface, even though the underlying program may be much newer. Maybe that can be addressed by a skin, but by default MC seems much "darker". Lots of black backgrounds. If someone can recommend a good skin for me that would be great, but I think the base MC product should be cleaned up and freshened (my .02).
2) speed, speed, speed. When I select a folder (album, sub category) in MC, I get a screen full of MC icons and one by one the images fill in. If I hit page down rapidly, I get another page full of icons, or if I go really far down, the whole thing slows down and i have to wait for it to "catch up". Picassa on the other hand is built for speed. Interestingly, Picassa has NO icon for a missing picture waiting to load. That concept does not exist. It seems to me all of the photos are loaded into memory at once. I don't know how, but they seem to be dealing with them as graphical representations, where MC is dealing with them as files to go read or create thumbnails. When you change the size of thumbnails, you can do so smoothly. The pcitures all change at once, but... and maybe this is a clue for you.... they are all out of focus. It takes a while for the screen to "sharpen" the thumbnails, but that is almost imperceptible to me. I can scroll up and down the whole page of photos, and yes Picassa keeps them all out at all times, and there is not delay .... all the pictures are just there. Every time I click to navigate within images in MC, I have to wait. It may be 1/2 second or at most 3/4 but it is a wait long enough that i notice at every step. (4.3 ghz, 1 GB memory -- not an underpowered machine). Okay, enough on that.
3) Picassa has a slower import. Maybe it is doing something on the front end to make all this speed possible, buidling a set of thumbnails? I dont mind the up front time, especially since it shows me progress quickly flashing each photo as its imported in a tiny status window. I see it and it feels like it is moving fast so I am happy with the import even though it takes longer.
Hope this helps make MC a better product!
Cheers!