well if you want a gaming motherboard.. that pretty much means something that can overclock well, and most likely contains more than 1 pci-express slot for SLi Or Crossfire.
The big Overclocking brands for the moment would be Gigabyte, Asus, and DFI, i don't know much about MSI, but i do know the board i got oc's very nicely...
and another thing.... there's different socket type motherboards, such as
socket AM2 (940 pins) - this is used for amd's new line of processors that use DDR2
socket 939 - Amd's older socket for their older cpu's that use DDR Ram
LGA 775 - Weird Pinless cpu's are used for these, this is an intel platform for their Pentium 4's, Pentium D's, Celeron D's, And Core 2 Duo's
Intel 3770k @ 4.4 GHZ | Galaxy GTX 770 SLi | 16 GB G.Skill Sniper | ASrock z77 Extreme4
2xSamung 840pro 128GB in Raid | 2x1TB Seagate | Antec 750 Watt GamerSeries
Intel Core i3 3220 | Galaxy GTX 650 | 8 GB Corsair Vengeance | ASrock B75M | Samsung 840 120GB