Oh say can he say...

Mama...and occasionally just Mom
Dada...and occasionally just Dad
Bubba...meaning Brother
All Done...usually comes out sounding more like "Ahhh NUN" 
Get Down..."geh dahn"
Please..."eeez"
Again..."ahhh GEN"
Uh uh..."un UHHH" with a a nice consistant sing-song rise and fall on the the second Uh.  Oh.  and a head shaking no as well.  This is said in response to almost everything.  If it weren't so adorable it would be annoying.  :)
Uh huh..."uh HUH" to be said with a heavy emphasis and an emphatic single head nod on the HUH.
Go..."doh"  and no, he has never seen the Simpsons.
and slightly...okay quite a bit...out in left field...
Owl.  Yep.  Owl.  He saw one on TV and completely unprompted by me, he said a clear Owl!
Up.
Choo Choo...."tsoo tsoo"
Everything else is "abba".
(resist the urge to sing Dancing Queen...he's more of a Take A Chance On Me kinda kid)
Every so often he points to an apple and says "abba" so he's kind of right on that one. :)

Oh.  And I almost forgot...
AhChoo! 
That one usually happens several times in a row and, although sometimes it is random, it generally comes as his imitation of Daddy sneezing.  :)

As I write these down I am pretty impressed with his vocabulary to date.  He is significantly delayed but this is solid progress!  With his lack of words we still have to endure a lot of ear-splitting screaching but that should only improve as his vocabulary expands.  I really can't wait to hear that little voice and all the complex thoughts he has going on in that adorable head.  :)