it can't be a mission that you get from a character or that is assigned to you....you have to find it by scanning planets
Zaeed started right after you picked him up.
Jacob started after Horizon. I just kept talking to people and the favor missions started going up, like with Mordin and Jack.
I was told that Miranda needed to talk to me, then she asked a favor and that Grunt is upset and I had to talk to him.
You'll need to talk to your squad on the personal level first, then Kelly will tell you that 'so-and-so' wants to talk to you or is doing something that implies something around those lines. They should start around the time you get the first round of squad mates or a little before that.
Yeah, I followed the steps...and I've got all three of the Dr. Pepper DLC. They seem pretty cool.

Dr. Pepper is running some EA promotional stuff with DLC for certain games, which includes Mass Effect 2. There's three stuff they have for people up at they're site so you can download it for use in ME2. Headgear, pretty much. There's a pair of goggles, a visor, and a ninja looking hood. The Sentry Interface, Umbra Visor, and Recon Hood. You can google them to take a look. I think there's pictures of them on the official Mass Effect website too, under arsenal armor.
You sign up for an account at Dr. Pepper's website (in this case, three accounts to get everything) and you input the code and redeem some in-game items.
You link it up with your EA account, and it's supposed to link up with your Xbox account.
Here's a look at the three Dr. Pepper items for Mass Effect 2.
http://masseffect.wikia.com/wiki/Umbra_Visor
http://masseffect.wikia.com/wiki/Sentry_Interface
http://masseffect.wikia.com/wiki/Recon_Hood
I never used my Inferno Armor. I actually think it's kind of BS the way Bioware handled that bonus stuff.
Out of all the armors I can only stand the Terminus and Collectors, I didn't download the Blood Dragon armor when I had the chance because the stats didn't appeal to me. 
I used the Inferno armor before the first talk with The Illusive Man, it was frackin fugly so I switched it out.Out of all the armors I can only stand the Terminus and Collectors, I didn't download the Blood Dragon armor when I had the chance because the stats didn't appeal to me.
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