I've always loved hydrangeas and have several plants in my front yard. The blooms are gorgeous and plentiful this year. I tell people it's because they haven't bloomed for two years. They suffered an early frost in October, 2009, and this is the first year they've bloomed since then. I learned that the blooms come from old wood, so maybe it's taken them this long to recover from that hard frost.
Some people amend their soil to get the blue color - mine must be perfect! It's interesting that some blooms are more pink and even lavender than blue!
My back yard pots look happy now too - it's not been so hot so far this summer.