You won't simply find any specific key words. You have to go by the specifications to what it supports, what it has like the number of sata or usb ports, the bus speed and memory it supports, the socket type like 775 for Intel or AM2/AM2+ soon to see AM3 out, if it supports SLI or Crossfire depending on chipset, and the list goes on.
Quality and how good a board is again depends on who made it and the type of build as well as any plans to oc cpu, memory, video card(s). With two eSata external drives you may 6-8 sata ports while some boards only see 4 ports in case you plan to see more then one internal drive put to use as well as sata type optical drives where the additional ports will be a thought there.
Newer boards now are seeing 3 and 4 PCI-E 16x slots on the 2.0 boards coming out. For SLI or Crossfire things are going sideways like someone else mentioned some time back. Again that is something you look for in the specifications or product information.
But then you also have to know what is meant by a "good" board for what? That brings you right back to the type of build being planned. Will it be a dedicated gaming rig or a work horse for multitasking? Or will it be for some simple web browsing without all of the "bells + whistles"?