Welcome to dakka Brent!
I put a list together the other day of the threads that have really inspired me... I thought I'd share it with you in case you were interested.
Gitsplitta's threads that Make you go "WOW!"
migsula's: "Legion: =I= munda" (The links in the blog are broken but the pics are in his gallery.)
grey_death's "Random WIP Thread" (grey_death goodness.)
grey_death's "Sons of Medusa" (Amazing work and the definitive example of sponge weathering.)
SONS of ORAR's "WIP" (Wow! Really, don't need a lot of words for this one.)
Roleplayer's "Blood Ravens and Blood Angels" (More Wow! Same as above.)
vent's "Various Ventures" (I just love vent's style... and you'll find some fantastic tips in here too!)
BLACKHAND's "Sabre Legion" (The brilliance can't help but shine through in this early blog of BLACKHAND's.)
BLACKHAND's "40k Skaven" (Which has unfortunately been tabled as a project but the blog is really amazing. Dammit BLACKHAND... this was such an incredible idea.)
Yggsdrasil's "The World Tree's Offerings" (Amazing kit bashes, conversions and painting. The thread that catapulted Yggs to super-stardom.)
Commissar Khane's "A squeaky Waaaagh!" (I love gretchin, and these are the best.)
Ifalna's "commission blogoblag" (The most approachable commission painter ever... oh, and lot's of "Wow!" If you want to learn how to do stuff... read this.)
Hit's_the_spot's "Another True Scale Project" (You get to see some truly remarkable works come together piece by piece, and man can Hits paint!)
IceAngel's "Ice Angel" (Ice writes just awesome fiction for his Blood Angels successor chapter, and with each installment he gets better and better.)
Eggrolls "Blood Angels" (Why do the Blood Angels get all the awesome painters??)
Arakasi's "Da Dark Angelz" (Arakasi's building skills are phenomenal and his imagination is unparalleled.)
Whalemusic's "The Great Marine Swap" (This thread is just inspirational from start to finish... and so many people have developed as modelers and painters throughout it's pages. Definitely a win all-round.)
And... some suggestions from friends:
monkeytroll's "cyborks & flyboyz" (This blog makes me laugh {in a good way} every time I open it!)
Neil101's "40k Manufactorum" (Terrain making, scratch building, kit bashing imperial guard thread... this blog has it all.)
BrotherArgos' "Space Marines? Iron Hands!" (Some of the cleanest, sharpest work I've seen around, worth your time.)
migsula's "::Legion at Rhisienne::" (somehow I'd completely missed migsula's current blog... that won't happen again!)
Gitsplitta's "Rebuilding the Mantis Warriors" (My epic struggle with my space marine chapter.)
Vitruvian XVII's "The Electric Imperium" (If Admech is your thing, there is a place for you on dakka... right here.)
Enjoy your time on dakka!
"Whilst we stand, we fight. Whilst we fight, we prevail. Nothing shall stay our wrath" 
Guilliman and the Ultramarines are like Manchester United, everyone hates them because they are so awesome! 
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