
I've shot quite a few weddings as a second shooter. Here is the workflow I use with the photographer I work for:
1) Upon arriving on site, I time sync both of my cameras with the primary photographer.
2) When the event is over, I go home and immediately download and back up all of the photos.
3) I cull out any test shots or out of focus shots to reduce the workload for the primary photographer.
4) That night, I upload the remaining files to a dropbox account set-up by the photographer I work for.
5) I wait until I receive a confirmation email from the primary photographer that all of the files have been received and backed up on their end, and then I will delete the files on my end.
That works great for us, but truthfully, the preferred workflow is completely up to the photographer I'm working for since he/she is the boss!

Bryan
Handing over a card does seem easier.

Contract that I have with my 2nd shooters is that no, they don't get to use these files... I will give them a commendation letter or a good word as needed... don't want one of my couples finding their pic on someone else's site and they not knowing who that person is...
Yeah, this makes sense. If I were a primary, I'd want to do it that way.

I have worked for many studios and friends here in Chicago and each has it's own requirements. Some studios have you shoot with their CF carrds and don't expect to see the images but pays good. Another studio lets me use the images for my portfolio only after they have blogged it first, the pay is so so. I don't mind what each person or studio's requirement is as long as it is negotiated or spelt out upfront with no suprises. My policy is you get what you negotiate!
Sounds like a trade-off. More money - no images. Less money - more portfolio

First by portfolio. We then usually have a phone conversation with them, and lastly, sit down to coffee and discuss everything from gear to experience. We currently have two second shooters, but more for backup purposes or needing a third helping hand.
As for the RAW, second shooters always use our cards, which we then take home. As much as we trust our associates, I cannot risk them losing or corrupting a card.
Seems to be the consensus. Looking at it from the perspective of the primary it does seem reasonable.
OK. So this may be a stupid question...but if someone is starting out as a second shooter and the primary keeps the images (which I understand the reasoning behind this) how does the second shooter build their portfolio to be hired as a second shooter? It seems kinda like the proverbial chicken and the egg scenario. Or would you hire a second shooter based on their portrait portfolio and recommendation from a photog they seconded for?