Wii and DS Wireless Connectivity issues

Recently, I noticed that my Nintendo DS wouldn't connect to our Linksys WRT54G. It turns out my PSP and my roommate's PDA would also fail to connect to our router. My Wii and my roommate's laptops had no problem connecting. It was odd that portable devices could not connect but laptops could. After some research on some forums, I tried switching the router's wireless settings from Mixed B/G to B only. This fixed the problem, and I thought everything was connecting fine. Now it seems the Wii will not connect. After switching it back to mixed B/G the Wii was able to connect again, but of course the DS or PSP fails. It seems the Wii supports G, but what I can't understand is if the router is emitting a mix, why can't portable devices connect? Another annoying glitch -- I need to switch the wireless mode depending on what device I plan to use. Is this a Linksys issue? I would like to try this on another router to see what would happen.

Further testing: After changing the Wireless Channel to 1, (thanks to Nintendo's support page), everything can connect in B-only mode. I still can't understand why the DS won't connect in Mixed mode. Oh well, as long as I don't have to keep fiddling with the router settings...