I have a Linksys 300N router and have tried hooking my 360 up to it.  Everytime I tried it it didn't seem to work.  I have an automatic ip setting and am wondering if it might be the wireless g compatability of the 360 wireless adapter, as the router will work with wireless g equipment.  I don't know what it could be my ps3 hooks up fine, but my ds and my 360 don't work at all.