My biggest peeve with Vista so far (besides my tendency to keep deleting the Recycle Bin instead of emptying it) is with the shortcut arrows for shortcut icons.
Granted, I'm running my different Vista builds in Virtual PC 2004, but still. Even after I have tweaked my screen size and display resolution, after I have adjusted the icon size...the arrows seem to cover up about 1/4 of the original icon. Yuck!
On my XP systems, I run TweakUI and have set the shortcut icons to display as itty-bitty tinnie-weenie arrows. Much more Icon, but still a small indicator as to the source of the icon link.
Unfortunately, there isn't a VistaTweakUI tool from Microsoft out...yet (if ever).
I did find these Vista tweaking tools that look promising...even if they are still in developmental stages.
TweakVista Utility - (free/beta) allows the user to adjust the UAP settings, IE 7 Search engine, DWM (Display Window Manager), some path environment tweaks. Kinda light-weight right now, but nicely interfaced and a great taste of what may be to come. Worked fine on Vista in Virtual PC 2004.
Tweak VI - (free/beta/$$-subscription) - Interesting and polished product that allows some basic tweaks in the free version, and more advanced tweaks in the paid version. Supports paid subscription "plug-ins" as well. Doesn't work on Vista under Virtual PC mode. Darn.
VistaBootPro 2.1 Beta (free?) - Allows power-users to make changes to the boot interface and loader configuration. Not for the faint of heart, folks...
More old-school -- tweak-it-yourself -- links:
TweakVista - Windows Vista Tweak articles.
Optimize Virtual PC 2004 Images (good a place as any...)
If you are running Vista, you can also hold down the control-key and use your scroll-wheel to resize the icons to a higher degree than choosing the sizes via the right-click menu from the desktop. This works in Virtual PC as well, BUT doesn't appear to work if you don't use a scroll-wheel mouse. I have a track-ball and it DOESN'T work for this icon resizing tweak. Bummer. Attempts to change the icon size via the properties, advanced desktop option menus don't seem to do a thing. They stay the same...Hmm... More exploration needed here.
Meanwhile, if any gentle readers can give me a registry-hack or lead on how to reduce the size of those shortcut arrows on my shortcut link icons, I'd be grateful.