What's the significance of the numbers 27 and 29 the Denver Broncos are wearing on the back of their helmets?

It's represent the jersey #s of the player who got killed that played for them.
27 Darrent Williams a CB got shot while at the stop light. This was in January '07. R. I. P.
29 Damien Nash a RB had fellout on the court while playing basketball for charity. This was in March '07. R. I. P.

GO BRONCOS!!!!!!!!!!!!!!!!

Believe those two players passed away this year..??

Those were the numbers of those two dudes that were died after last year. One was shot in a drive by and the other died from a heart attack, he collapsed and died, I think it was in a charity basketball game or something like that. They mentioned the names in the game but I'm not a Denver fan so I can't really remember.

I believe they are for their teammates Damien Nash and Darrent Williams who recently passed away.

Well 29 and 27 were the two Denver Broncos that died last year.

those are the numbers of two players that dies recently. they were both only 24 years old. one was darrent williams and the other was damien nash. it was very tragic and hit the team very hard.