I highly recommend you check this website. It has the most in depth and up to date reviews of monitors of any website I have seen.
http://www.tftcentral.co.uk/reviews.htm
It has a review for both the U2410 and the U2311H.
I went for the U2311H, and I will never buy a TN panel again. The U2311H is consistantly has more accurate colors out of the box, and there have been repeated reports of the U2410 Having green-pink hues.
The biggest difference is that the U2410 uses a H-IPS panel, which is a more expensive panel, and is has a WIDE GAMUT.
The U2311H has standard color space, slightly less input lag (good for games) and slightly higher (8ms) grey to grey speed rating (bad for gaming), and this monitor uses STANDARD color space (not wide gamut).
I don't fully understand wide gamut, but I do know that for everyday applications you will be fine without it. On the contrary, some applications with make the wide gamut can make colors look really screwy, due to the software not knowing how to tell the monitor to draw normal colors in wide color space... In other words reds and bright colors can look atomic instead of normal.... You will have to research if you want a better explaination than that. If you are a pro photographer you may want the extra color space.
That said, I spend more time gaming than anything with my U2311H, and I play mostly shooters and starcraft 2, both of which are great on this screen. Coming from a 5MS TN panel I hardly notice a difference. You may be able to see a little ghosting sometimes if you really look for it, but overall I am extremely satisfied with this purchase.
After returning 2 top of the line samsung TN panels, and a Asus TN panel, I can fairly say that the U2311H e-IPS screen has a far superior picture quality than ANY TN panel I have ever laid eyes upon.