1. Balance of Terror
2. Andorians
3. The Enterprise NCC-1701 (any model will do)
4. Captain Spock
5. Spock dying
6. First Contact
7. Darmok
8. Romulans. 
9. Spock
10. Earth attacked by the Xindi
11. Science Officer
12. Security Officer
13. The Magnificent Ferengi
14. Tapestry
15. Spock
16. Starfleet Command / Armada it's a tie on this one.
17. Q Squared
18. Breen
19. Blink of an Eye
20. Barclay
21. Neelix
22. Star Trek IV The Voyage Home
23. Tricorder
24. Galaxy Class Starship
25. The Forge / Awakening / Kir'Shara (three part so I'm counting it as one.)
26. Risa
27. Mayweather
28. USS Ulkesh
29. "It is possible to commit no errors and still lose.  That is not a weakness.  That is life."  Captain Jean-Luc Picard
30. Old school TOS is my favorite.
31. Where No Fan Has Gone Before - Futurama

This is so cool! I can't wait to see all your responses. I'm about to sleep now, so I will think on my answer and post them tomorrow first thing while at work. :P

Instead of 30 days however just one post with all 30!  And I'm adding a 31 favorite Trek parody.

A C E

:)

B (that's one sexy Nausicaan, rawr!) and D 

Because all of these look so good, I'm voting based largely on the reasonings given for the design in addition to what, in my opinion, is the most important uniform element--a clearly visible distinction between the 3 tracks. 

On the battlefield, being able to tell at a glance who can patch up your wounds and who would be better patching up a turret can mean the difference between a glorious victory and a swift entrance into Sto-vo-kor. 

Thus, my choices are: H, F, and C

(also congrats to H for managing to use the same system as DISCO without letting Tactical and Engineering be so indistinguishable that I physically can't tell them apart) 

D

A

B

:-)

A B D

Editorial note: I would like to register my displeasure with the voting administration for removing the third photo in my entry that shows what my uniforms looks like in their complete form. You're horrible people and should be ashamed.

All look amazing!  D B H are my choices.

D A C

G B H!

D F G

D as it's pretty much what I'm wearing

A 

C

D B G

D E C 

Great work to all designers! 

A D E

D  F  H

Good luck to the designers.

BCG.    Luck to those who entered.

A C E.

EDC