It's possible to get the rt2500 working with NetworkManager via ndiswrapper. You just need to find a copy of rt2500.sys and rt2500.inf and use ndiswrapper to install them. A gigantic hack, but good if you're desperate to get NetworkManager working. Of course NetworkManager and ndiswrapper have their own set of issues (bug # 85468).
It's possible to get the rt2500 working with NetworkManager via ndiswrapper. You just need to find a copy of rt2500.sys and rt2500.inf and use ndiswrapper to install them. A gigantic hack, but good if you're desperate to get NetworkManager working. Of course NetworkManager and ndiswrapper have their own set of issues (bug # 85468).