Alright, a lot has happened since the last time we ranked fighters, let's see them.
Im only doing top 5 in each weight class and a top 10 P4P list.

Heavyweight:

1) Brock Lesnar-(5-1, UFC)
Last fight: WIN over #5 Shane Carwin
Next: vs. Cain Velasquez, UFC 121
2) Fabricio Werdum (14-4-1, Strikeforce)
Last fight: WIN over #1 Fedor Emelianenko
Next: undecided
3) Fedor Emelianenko (31-2-1, SF)
Last fight: LOSS to #9 Fabricio Werdum
Next: undecided
4) Cain Velasquez (8-0, UFC)
Last fight: WIN over #7 Antonio Rodrigo Nogueira
Next: vs. Brock Lesnar, UFC 121
5) Junior Dos Santos (12-1, UFC)
Last fight: WIN over #12 Roy Nelson
Next: undecided

Next five: Alistair Overeem, Frank Mir, Shane Carwin, Bigfoot Silva, Big Nog

Light Heavyweight:

1) Mauricio 'Shogun' Rua (19-4, UFC)
Last fight: WIN over #1 Lyoto Machida
Next: vs. Rashad Evans
2) Rashad Evans (15-1, UFC)
Last: WIN over #3 Rampage Jackson
Next: vs. Shogun Rua
3) Lyoto Machida (16-1, UFC)
Last: LOSS to #2 Shogun Rua
Next: vs. Rampage Jackson
4) Quinton 'Rampage' Jackson (30-8, UFC)
Last: LOSS to #4 Rashad Evans
Next: vs. Lyoto Machida
5) Forrest Griffin (17-6, UFC)
Last: WIN over Tito Ortiz
Next: undecided

Next five: Jon Jones, Lil Nog, Thiago Silva, Rich Franklin, Ryan Bader.
(no one outside UFC should be ranked at LHW now IMO, Lawal beat Mousasi but lost to Cavalcante, yet Feijao lost to Mike Kyle in his last three fights.)

Middleweight:

1) Anderson Silva (27-4, UFC)
Last: WIN over #2 Chael Sonnen
Next: vs. Chael Sonnen
2) Chael Sonnen (25-11-1, UFC)
Last: LOSS to #1 Anderson Silva
Next: vs. Anderson Silva
3) Jake Shields (25-4-1, UFC)
Last: WIN over #3 Dan Henderson
Next: vs. WW Martin Kampmann, UFC 121
4) Nate Marquardt (29-9-2, UFC)
Last: LOSS to #2 Chael Sonnen
Next: vs. Rouismar Palhares
5) Demian Maia (13-2, UFC)
Last. W v. Mario Miranda
Next: undecided (prob Alan Belcher)

Next five: Yushin Okami, Vitor Belfort, Jorge Santiago, Jacare, Dan Henderson

Welterweight:

1) Georges St. Pierre (20-2, UFC)
Last: W over #5 Dan Hardy
Next: vs. Josh Koscheck, UFC 123
2) Jon Fitch (23-3, UFC)
Last: W over #3 Thiago Alves
Next: undecided
3) Thiago Alves (17-7, UFC)
Last: L v. #2 Jon Fitch
Next: undecided
4) Josh Koscheck (15-4, UFC)
Last: W over #6 Paul Daley
Next: vs. GSP, UFC 123
5) Nick Diaz (22-7, SF)
Last: W over Mach Sakurai
Next: vs. KJ Noons

Next five-Paulo Thiago, Dan Hardy, Paul Daley, Martin Kampmann, Carlos Condit

Lightweight:

1) Frankie Edgar (12-1, UFC)
Last: W over #2 BJ Penn
Next: vs. Gray Maynard
2) Gilbert Melendez (18-2, SF)
Last: W over #4 Shinya Aoki
Next: undecided
3) B.J. Penn (15-7, UFC)
Last: L to #1 Frankie Edgar
Next: undecided
4) Shinya Aoki (24-5, DREAM)
Last: W over #8 Tatsuya Kawajiri
Next: undecided
5) Gray Maynard (10-0, UFC)
Last: W over #5 Kenny Florian
Next: vs. Frankie Edgar

Next five-Evan Dunham, Kenny Florian, Eddie Alvarez, Benson Henderson, Crusher Kawajiri

Top 10 Pound for Pound:
1) Anderson Silva (MW/LHW)
2) Georges St. Pierre (WW)
3) Jose Aldo (FW)
4) Frankie Edgar (LW)
5) Jake Shields (WW/MW)
6) Jon Fitch (WW)
7) Fedor Emelianenko
8) Mauricio 'Shogun' Rua (LHW)
9) Gilbert Melendez (LW)
10) Rashad Evans (LHW)


Yours?