Seeing as I have no mod points, I’ll just have to second you. Mine’s a HP LP2475w, which I suspect has about the same kind of panel. It had a very nice stand by itself (allowing easy rotation), but I bought an Ergotron LX wall-mounted arm for it (I highly recommend it).
It was a little bit weird at first, but once my desk set up adapted to it I love it. The extra space on the desk is quite nice, I can move the screen far from the wall (and closer to the strategically-placed couch) for watching movies, I can move it to the side when I need desk space for tinkering with stuff or to show people things without having to look over my shoulder, and of course I can keep it in portrait mode for work. It’s in portrait mode most of the time, actually (pretty much the only reason for landscape mode is movies and occasionally showing photos; I don’t play games much, but that would be the other case).
It’s ridiculously convenient for browsing the web, reading books and comics, any kind of document editing including drawing (the only time I felt I needed landscape mode in the Gimp was when editing a very very wide panorama), programming (I can’t stand debugging in Eclipse on a landscape screen anymore), and even silly things like looking at a music play-list. (My window manager has a rule to keep Amarok’s window always fullscreen for exactly this reason.)
The only slight annoyance is that the window list on the panel (in Gnome at least) can feel cramped if you use more than a dozen windows at a time. I rarely do, but then again I got so used to the Compiz tricks for window management (one of my mouse’s buttons triggers the Expose-like feature) than I rarely use it, actually—most of the time the primary window I need is full-screen, not just maximized, so it gets the entire glorious screen estate. (And I’m a bit of a freak about that; my Firefox browser got tweaked and addonned that I all menus (everything but the displayed page) take only about 100 vertical pixels, leaving the other 1820 just for me :D)
And yes, I do remember that at the beginning I felt the screen looked very narrow; it actually looked much more “narrow” in vertical mode than it looked “short” in horizontal mode. I think it’s just a matter of what your brain expects: I remember having a very similar “weird” feeling when I switched from 4:3 screens to widescreen, that it was much more short&wide than it actually was. The feeling disappeared then as now, and I feel very constrained when I can’t turn the screen (e.g., on other computers or laptops). I actually started to turn laptops on their side, like a book, for things like reading (or browsing, if I have a separate mouse), which can get you some weird looks from people, especially from their owners :)
Basically the only constant difficulty was to find a wallpaper that works well in both modes. (Though I’m using a shortcut to change the screen orientation in software, and I’m sure the wallpaper could be changed at the same time if I really wanted it to; I bought an USB accelerometer, intending to tape it to the back of the screen to make it switch the desktop automatically, but I never got around to programming it.) I used a 1920x1920 crop of a Hubble photo for a while, but now I’ve had some abstract thing that I think is the default one in Ubuntu for a few months and never noticed it.