The good news is, the HP LP2475w gamut easily covers Adobe(1998), see attached Gamutvision screenshots. The wire frame gamut is the monitor profile generated with Eye-One Display 2. See how the wire frame easily encompasses AdobeRGB(1998) and is really much bigger that sRGB.
The bad news, all non-color savvy apps such as Internet Explorer will display images way too saturated (that's how it is with wide gamut screens, you can't blame HP).
The only web browser that will display your (and anybody else's) website properly is Firefox 3 with color management enabled.
In the address bar type about:config then click "I'll be careful, I promise!" then place this in the filter gfx.color_management.enabled then double click it to set it to enabled. Restart Firefox.
The other bad news, the screen isn't quite uniform. The right side of the screen is slightly but visibly warmer (redder) than the left side. I calibrate a 'sweet spot' just left of the centre and check my images there. Apparently this is not uncommon for this type of screen.
Also, by default the RGB channels are set to 255, 255, 255 which is way too high. You can adjust the Brightness down to 20 or so but that gave me an uneven calibration with too much red in the highlights. I first set the RGB values in the on-screen display to more moderate values, say 180, 180, 180, and a higher Brightness, 70-80 or so, and then start calibration. This gave me a much smoother result (easily check by making a smooth 16-bit gradient in Photoshop from black to white across the entire screen, then check for color banding).
Yet different bad news, the supplied DVI cable gave me green sparklies and jitter. However, the supplied HDMI-cable gives a stable and clean signal. Maybe it's not the cable but the DVI-inputs. DVI-input 1 was worse than DVI-input 2. I called HP and they authorized a DOA (dead on arrival) exchange without fuss.
All in all, for the price, I'd still recommend the screen. The only real disappointment is the lack of color uniformity across the screen.
Hope this helps,