Hey, figured I'd share with the group here.
I have tried two "ypbpr to rgbhv" mayflash boxes and was unsatisfied how the transcoders darkened the image and would flicker on and off horridly with 480p signals.
Since then those two transcoders have sat in their boxes while I play the Wii through a tv tuner pci card (horrid quality imo) with composite.
Well, for those out there still wanting to hook their Wii to their monitor for cheap and look good, I found a product that imo is better than the recommended previously mentioned transcoders. I picked up a KWorld TVBox1440 today out on a limb. It's one of those seperate tv tuner boxes that takes a coaxial input and a vga output to the monitor, I can't comment on how good the tuner on it is.... I use DVI from my DVR for cable tv.
Here's the skinny:
-Variety of output resolutions selected from an OSD (including 1440x900)
-Variety of image adjustments (brightness, etc)
-VGA out, also a VGA in from your computer but I don't use that.
-YPbPr Component In
Here's the kicker... I didn't see it listed on the box or instructions anywhere but it will accept progressive scan signals.
I personally am very pleased, it does a very nice job of taking the Wii's 480p output and converting it to a 1440x900 vga signal.
It's $60 at Fry's, so at least you can probably buy it locally and return it if you don't like it.
Anyway, I'm happy with it. Figured I'd share the info.