Right down the road a bit from the stadium (at the border to the strip district) on smallman st. is the Senator Hienz Western PA History Center. If you're from the burgh it'll take you back a few years (to some stuff I remember as a child), but even if you're not- you gotta check out the Western PA Sports Museum
I went there when I was in town last year, and it is simply awesome
. Joe Greene's helmet from our first Super Bowl. Franco's shoes from the immaculate reception. (just the tip of the iceberg). Definitely check it out, I promise any Steeler fan would not regret it.
Oh, and a couple blocks further in the strip is the original Primanti Bros., no trip to Pgh would be complete without stopping there!
Yinz have fun!