Receiver manufacturers come out with new models every year. Before the 471 was the 467. Last year the 471 was replaced by the 473. This year the 473 was replaced by the 475. Every year some new feature or connection is developed and they need to incorporate them into their new line so give it a new model designation. The 471 wasn't discontinued because it was subpar or defective. If it has the features and connections you need then it should be fine. It is a 2-3 year old model so it may not have the streaming abilities a newer receiver will have. It was a well regarded receiver when it first came out. But what speakers and other devices will you be using with it?
Here's the Yamaha home page for the 471
Crutchfield also has a lot of go information on the receivers they sell. Here's a link to the 471 when they had it for sale.
"Everyday room": Panasonic 58" Plasma, Dish HD DVR, Pioneer Elite vsx-23, BDP-23 BR, dv58avi universal dvd player, Dynaudio Audience 50's, 40's 122C, Dayton HSU-10 subwoofer.
"Movie/Music room": Toshiba 65" DLP, Dish HD receiver, Adcom GF-700 5.1 receiver, OPPO BDP-80 BR player, Polk LSI25's-LSi7's-LSiC, 2 original Dayton 10" "Mighty-Mites" subwoofers. (subject to change without notice).
Also have...too much to list. Help me.