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You guys must be using a different Vista to me. It is not perfect by any stretch, but it makes it tolerable to run as a non-admin.
No-one likes when [insert vendor] moves [insert feature] around. There was the same complaint with the XP start menu and control panel. The rearrangement of things may have bugged me, but search is so quick I hardly use menus anyway.
On a side note, if it bugs them that menus get moved around, I don't think a migration to another OS will be fun for them.
In terms of crashes, I have had no issues, and no application compatibility issues, and UAC is pretty quiet (just as quiet as sudo for me). The software we write required no specific modifications for Vista. Crappy software that presumes admin rights to run when it doesn't really need them may send UAC prompts when launched. Software that sucks will lose popularity.
I have no associations with Microsoft except our company has a MSDN subscription.
Adam