So I got the Fallout 3 GOY edition with all the DLC and I was just wondering what a good point in the game is (without too many spoilers) to start the DLC. Thanks! :)

Personally, I didn't tackle any of the extra stuff until after I'd finished the main quest.

Personally, I would play the the original story first and then the DLC.

Personally, I say it doesn't really matter.

Personally, just mix them in with the main story. You get nice armor and weapons from it. 

Personally, save em til the end so you can just rape.

whenever you want

" @mazik765:  do anchorage about 20 hours into the regular game because its super easy no matter what your level is. and helps to take a break from the brown world. play the pit after about 20 more hours to take a break from the regular map again. the pit is a bit more difficult. finish game do steel. which opens the game back up. do lookout. lookout is difficult as crap so be careful your gonna die a lot. then do zeta. because its a great send off to the game and pretty much just leaves you  to mop up any sidequests or unfinished exploring you want to do in the standard wasteland with some great weapons. "

Personally... I don't even know cause I don't own the game.

" @Rockdalf: 
did they ever patch the anchorage glitches that finish the other quest and gives you armor training when you complete it?
 
@Castiel: then why did you even answer? "

Just do it whenever...it's not going to spoil anything. Only Broken Steel has a chronological part to it, and you can't encounter that till after the main story.