InsideHW.com has compared seven Intel H55/H57 motherboards signed by ASUS, Biostar, Gigabyte and MSI, which are the most common choice of buyers. Here's a bit:

It's clear that the selection of H55 and H57 motherboards is more than good and that putting a Core i5 system together is no longer reserved only for those with deeper pockets. We had hoped to simplify the choice for the buyers by this roundup, but alas, none of the models we've tested can be considered a bad buy, while each one has arguments in favour of buying that model in particular. Let's see where they stand in the overclock universe. The cheaper Biostar reached a very high result, but one shouldn't forget that the default clocks produced weaker results on these motherboards than the rest, and even at their best, they weren't significantly faster than the other models. Therefore, Biostar is the perfect choice for showing off, but only to those that value additional features little. It must also be said that Biostar is hardly the champion of software support and regular BIOS update intervals, where other companies fare much better.

Now onto the overclocking possibilities of the GPU itself. As much as Intel's been praising the significant advantages of its latest GPU generation, and the motherboard manufacturers trying to enable their overclock, we're still dealing with a derivative of the GMA X4500 core, which has twelve instead of ten programmable shaders and is barely sufficient for playing newer games even at the lowest detail levels. Older games don't necessarily scale up in performance, since the game developers have been trying to optimize their games for Nvidia and ATI cards for a number of years now, so it may occur that certain older games work very badly or don't work at all. When the frequencies themselves are considered, even if you happen to come across a CPU sample with GPU cores apt for overclocking, the fact that you're going to increase their frequency by 40% will mean absolutely nothing in actual practice, since you'll be getting five instead of three frames per second in newer games

Now, onto the motherboards as a whole. The conclusion is much the same as ever: the most expensive models are to be bought if you require additional functions such as the new generation of SATA and USB ports, mid-class models of recognised manufacturers will be bought by users which pay attention to (apparent) details such as the SPDIF output and Firewire, but also “peace of mind” owing to well-cooled chips, while Biostar motherboards remain traditionally aimed towards overclockers and enthusiasts on a budget, which care little about appearance and the accompanying bundle.