Sorry if this is already widely known, but I hadn't seen it.
The BTN has posted its coverage map for this week's games: http://www.bigtennetwork.com/gamefinder/index.asp
(The map shows you which will be the "featured game" in your area. The other games will be available to you either on overflow channels or not at all.)
The most interesting feature is that you can type in your zip code and cable system, and it will tell you whether your system is showing games on overflow channels and whether they'll be in SD or HD.
For example, if you are living in Atlanta (zip code 30301) and subscribe to Comcast, at noon on Saturday you only see OSU vs. Youngstown State, and not in HD. So you will be deprived of watching the glory of Penn State vs. Coastal Carolina in HD on your plasma screen.
On the other hand, if you're living in DC (zip code 20006) and subscribe to Comcast, you get all five noon games on overflow channels, albeit only in SD. (I remember someone was concerned about whether Comcast would show overflow games in DC, so hopefully this is some reassurance.)
This may not seem that important right now because Michigan isn't on the BTN this week, but if you're a cable subscriber outside the Big Ten footprint, it's worth looking into. Presumably, the cable companies that have overflow channels this week will do the same in the future.
Michigan is a big national draw and will often be BTN's featured game, the way OSU vs. YSU is this week. But it's very possible that at some point this season, Michigan will be on BTN as a non-featured game. You'll want to know if you'll get that game at home and whether it's in HD, or whether you need to switch to DirecTV or Dish Network.