In other news, we've been back a couple weeks from a ballpark vacation which bona describes in some detail here. We saw 6 ballgames in five parks (Comerica in Detroit, PNC in Pittsburgh, Camden in Baltimore, Great American in Cincinnati and Nationals Park in DC.
We had a great time on our trip, despite getting rained in during 5 of the 6 games. I think my favorite park we saw was PNC (and that was the game that was completely rained out!), too bad the Pirates play there :) We had pretty good seats for all the games. If you're looking for a pretty good but not horribly expensive seats, I'd recommend the upper deck behind home plate, you get a nice view of the park at a good discount.
We had only planned on seeing 5 games but decided to add a second game in Baltimore as it wasn't supposed to rain and there were lots of good seats available. (Orioles vs. Royals what do you expect) We treated ourselves to 7th row behind the visitors dugout seats, not cheap but available at the box office 7 hours before gametime. All in all, a good trip.