Female: Wozniacki
Male: Chang
Mixed Doubles: Jankovic
Men's Doubles: Harrison and Michael Venus
Women's Doubles: Chanda Rubin
Favorable Mention:
Dementieva ending her career by winning the Olympics.
That's a pretty nice list, especially expanding it out to the doubles categories.
For men's doubles, I'm sure there are lots of great stories, but I liked how Mats Wilander and Joakim Nystrom, who were childhood friends, won the Wimbledon doubles title together in 1986. While Mats won 7 singles Slams, including a couple on grass at the Australian Open, many people feel like he has a hole in his resume by not doing better than a QF in singles at Wimbledon. I feel like the doubles title at Wimbledon helps fill that void a bit, plus it was Nystrom's only Slam in any category. Mats once made a comment that the happiest moment he ever had on a tennis court was when he won that Wimbledon doubles because he got to share it with his best friend.
In mixed, Jack Sock and Melanie Oudin winning the US Open was pretty epic. After Oudin's epic US Open QF run in singles in 2009, that mixed title in 2011 is pretty much the cap of her career since she was sidelined with injuries after that. Of course, Sock has won a couple other Slams in doubles now, but that was Oudin's only one.
For people from the PNW, Travis Parrot of Portland, Oregon won the 2009 US Open mixed with Carly Gullickson as their only Slam title. Others, like Jonathan Stark of Medford, Oregon, and Patrick Galbraith (now the USTA President) of Tacoma, Washington won a couple Slams each in doubles, so I guess they are out of this conversation.