The wrt54g is OK for straight forward use, I've had one for about six weeks now. If you are uncertain about setting up file & printer sharing etc, or if you want to check network settings and connections I can recommend running a trial of NetworkMagic from
http://www.networkmagic.com.
If you get the wrt54g post back with problems or visit
http://www.linksysinfo.org. If you use bittorrent or other p2p software you might have to delve a bit deeper into settings.
Best regards
Mick