I speak up to defend my o'l trusty WRT54G router and its brethren.
It continues to provide excellent Internet bandwidth of usually 30mbps (even though I pay Comcast for 20mbps minimum). The old router was helped along last year when I replaced the Linksys modem with a new DOCCIS 3 modem from Motorola. Basically, if you want an Internet connection speed above 15mbps, the modem has to have the guts to do so; hence the DOCCIS 3 modem upgrade. (BTW, I was lucky to get 20mbps before the modem upgrade.)
Since my network is all wired, the internal speed of the router's 100mbps is still fine. Whenever I use wireless, the results are the same with WDTV as wired: excellent. My experience with wireless over many years is, if you cannot get an excellent to very good signal strength consistantly, you are better off wired. Fortunately, the house came wired, CAT5-ready, and I have taken advantage of that throughout the house.
All this is not to say that a newer router could not improve things more, and if this was a wireless house I would step up to wireless.n. Not sure that a newer router would improve my wired situation. Does anyone care to convince me otherwise?