I am also a devoted Warhammer 40K player, and Imperial Guard is my favourite army. I remember when I bought the book just looking at the new Punisher stats made me drool. Now, I have 3 of them in my Army 
Do you like making a horde army, a mechanized army, or a mixture?
Both
10 Leman Russes (3 Battle Tanks, 1 Demolisher, 1 Plasma Tank, 1 Punisher, 2 Exterminators, 2 Vanquishers), 3 Basilisks, 6 Sentinels, 2 Chimeras, 2 Hellhounds, 1 Banewolf and a Baneblade. I like tanks
+ 80 infantry, 2 platoon command squads, 1 commander squad (+ advisors), 10 Storm Troops, 3 heavy weapon teams, Techpriest, 3 ogryns, tons of special weapons, and closets worth of spare bits.
I should post a pic, but I don't have a decent camera at the moment... and 95% of my models are unpainted, so it's not much of a sight.
Aha... I do have a pic of one of my heavy flamers... just try and picture my entire army looking kinda like that:

Except I don't think I'll be using matte varnish again... Ugh...