Okay I'll try to bullet list this to simplify what I typed, it was late and I likely rambled a little.
Still it seems many of you agree with my first point.
1- Utilize HD resolutions when designing the menu, allow a toggle switch that defaults to huge font size if playing at 480i/p. This wouldn't onlly be text though, sure make the font size half as big , but I'd also like it if every graphic used in the design of the blade interface was displayed at it's actual pixel size, including the blades themselves. So in 720P or 1080i/p there would be bigger , crisper images used with smaller text. It'd just make the whole thing look slicker.
2-Allow the user to customize the way downloaded content is sorted- the existing list, windows thumbnail style or perhaps an individual blade for each piece of content
3-Add fast forward and rewind capability to the music player
4- streamline the blades/menu options so there is only 1 selection for marketplace instead of 2 or more
5-Add something similar to an ID tag for games/movies/cd/cdr that would tell you the title of the disc inserted, future games could even have a picture and/or music like the psp/ps3 do, existing stuff would just have the name.
----
Also, and this is my my opinion not some stated fact, I like the XMB on ps3 becuase it IS formatted to properly utilize HD resolutions , it does the whole ID tag thing AND it's marketplace uses real money. I may not like using the thing for online games and don't own one myself yet but based on time spent with a friends it atleast looks slick.
As for the wii, it's just a really simple interface, everythings right there you just point and click, then bam.
---
Of all the things I'd like in the 360's menu one thing I don't care at all about is a web browser, a comprimise however becuase I know some people feel they should have a browser to compete with nintendo and sony, is to simply have the ability to play flash video by means of connection to PC or entering a URL. See unlike the other 2 , microsoft assumes naturally that you allready have a PC with internet and adding internet to the 360 would be superfluous , I agree with this. So they simply release a tool that allows you to drop in your favorite youtube videos or flash cartoons by essentially copy pasting the URLs and when you turn on your 360 a new tab would be under media that would have that list of favorites , you'd simply select a video and boom.