I am a huge fan of It's Always Sunny in Philadelphia, and I was pleased to hear that already (before it's 4th season has even aired) the network gave it the greenlight for a 5th season. I don't know how often that happens, but it's definitely great for the fans who followed this show from day 1 (like me). FX also has some competitively great programming, I think!

It's Always Sunny in Philadelphia (FX)
Thursdays 10:00/9:00c

                      Viewers
Date                 (millions)   A18-49       A25-54
-----------------------------------------------------
Sep 18 2008            1.73       0.9/ 2       0.7/ 2
Sep 18 2008(10:30)     1.60       0.9/ 2       0.6/ 2
Sep 25 2008            1.44       0.8/ 2       0.6/ 1
Sep 25 2008(10:30)     1.35       0.7/ 2       0.4/ 1
Oct 02 2008            1.02       0.5/ 1       0.5/ 1
Oct 02 2008(10:30)     1.02       0.6/ 1       0.4/ 1
Oct 09 2008            1.28       0.7/ 2       0.5/ 1
Oct 16 2008            1.27       0.7/ 2       0.4/ 1
Oct 30 2008            1.15       0.7/ 2       0.5/ 1
Nov 06 2008            1.36       0.7/ 2       0.4/ 1
Nov 13 2008            1.31       0.7/ 2       0.6/ 1

Testees (FX)
Thursdays 10:30/9:30c

                      Viewers
Date                 (millions)   A18-49       A25-54
-----------------------------------------------------
Oct 09 2008            0.98       0.5/ 1       0.3/ 1
Oct 16 2008            0.87       0.5/ 1       0.4/ 1
Oct 30 2008            0.70       0.4/ 1       0.3/ 1
Nov 06 2008            0.72       0.3/ 1       0.2/ 1
Nov 13 2008            0.71       0.3/ 1       0.4/ 1