The Reds hired Thom Brennaman today. Marc says:

The Reds today hired Thom Brennaman to join their radio and TV broadcast teams and signed him to a four-year contract through 2010. Thom will be in the radio booth for “selected” broadcasts alongside his father and also will do television.

Marc goes on to speculate that Thom will call 45-50 games for WLW, which will mean they'll need another color guy for the other 100+ games.