You set up a poll every 3 or 4 days.
The first poll would be the 49ers.
"With the first pick in the 2005 NFL Draft, the San Francisco 49ers select:"
Then you put 4 or 5 players and "other" as options.
The members of Soxtalk vote, then, after 3-4 days, the vote is tabulated.
The next poll has The Dolphins and 5 different options, with the 49ers pick in the written area...It's a perpetual thing, until all 32 picks are done.
Towards the end, you can speed up the voting time if you need to, so that the mock draft is over before the real draft begins.