Similarly, I'd like to torpedo MSIE's habit of creating a new empty window to exactly the dimensions of the last window created, which yields really stupid results when the last window was a farking pop-under.
Yeah, I know, use Mozilla, and for some things, I do. But I could list as many window-management eccentricities for any number of Mac programs, Classic and OS X alike. (Office for OS X is particularly inscrutable in this regard.) Web browsers tend to highlight these problems because it's in the nature of Web browsing to create a lot of windows in quick succession. Surely I'm not the only user nutty enough to care about this.
Paradigm shift: After weeks of shuttling the Dock all over the place and shrinking it down as far as my middle-aged eyes can tolerate (I have "presbyopia," which means my eyes are opposed to rule by bishops), I've suddenly realized that if you just make the damn thing really big suddenly you can see beautifully-detailed icons of all your minimized windows, and that moreover in many cases you can watch as processes in those windows go through their paces. (A minimized Terminal window is particularly nifty in this regard.) This is actually worth losing screen real-estate for. Rocking.