I see there are quite a few vendors selling cards build with Ralink's chipset. I'm using one myself, the SMCWPCI-GM which uses Ralink's RT61 chip.
Is this the most popular solution? Besides mine, there are Gigabyte, Linksys and a few others that use it. I took a look at the various web sites to get some idea of driver support. Almost all the companies offered old drivers, while Ralink themselves, offer their reference drivers, updated frequently new as of December 2006. I'm using it myself, since it seems to contain the driver, utility and if I'm not mistaken, even updated Firmware thrown into the package somewhere.
In my case, the driver on the CDrom was almost a year old, the driver at SMC site wouldn't install at all. What with the slightly unusual installation procedures, The hit and miss of the wireless signal itself (I'm currently in an apartment. No Line of site,
5 - 8 of my "neighbors" showing up in the ste survey). Im amazed it works at all.Dave