OK, well "know" might be a bit of a stretch. More like "Agents I've Been Rejected By Who Seem Cool on the Other End of the Mail/Email/Telephone." Here, in no particular order except for the first 2, are my Top 10.
1. Susan Ginsburg, Writers House. LOVE HER!!!!!!!!!!! Amazing woman - kind, encouraging (the fact that she loved my concept, though perhaps not all of the delivery, helped a bunch); wrote me a fantastic personal letter explaining all the reasons she was concerned about my plot. I'd query her again in a heartbeat.
2. Natasha Kern - Called me after 3 months from out of the blue to personally apologize for misplacing my partial and asked for the full. Tremendously pleasant and down to earth on the phone and also wrote a nice, personal letter when she finally said no.
3. Deidre Knight - Again, really nice and enthusiastic emails, even the final rejection one.
4. Pam Hopkins - Nice, personal letter of rejection even though she only read a partial.
5. Vivan Beck - Requested my full from my original email query; really quick response.
6. Roberta Brown - Nice, personal letter (printed on crazy confetti-colored paper...)
7. Susannah Taylor, Richard Henshaw Group - Nice, personal letter after she read my partial; apologized for taking so long.
8. Scott Eagan, Greyhaus Literary - Seems like a nice guy, included some helpful advice after reading and turning down my full.
9. Michelle Grajkowski, 3 Seas - Nice, personal letter after turning down my partial (surprising because their agency asks everyone to send in a partial with the query).
10. Kristin Nelson - She's turned down my query every time, but I love her blog and I love that she's so technologically savvy.
So, amid the reams of form rejection letters, some with spelling and grammar errors, some on half-sheets of paper ('cause I don't deserve a full sheet, obviously), and some that are just stamps or scrawls across my original query letter, those 10 were gems.