There are several different places I have swapped through, some good, some not so much.
Here's a list of online communities where you can find me swapping if you'd like to join in.
I also started my own Project Life themed swapping group on swap-bot:
I also have swapped via these wonderful blog sites in the past, although it has been quite a while:
I also am interested in one on one swapping privately as well, so feel free to email me and let me know what you'd be interested in swapping me via: email@example.com