There are 19 nominees this year and 5 will be selected for induction. You can vote on their website, although I'm not sure how much weight goes into the public voting. There's been a bit of controversy in the past over the actual selection process. I'm surprised some of these artists aren't already in the HOF:
Rock & Roll HOF Fan Voting
Bon Jovi
Kate Bush
The Cars
Depeche Mode
Dire Straits
Eurythmics
J. Geils Band
Judas Priest
LL Cool J
MC5
The Meters
Moody Blues
Radiohead
Rage Against the Machine
Rufus featuring Chaka Khan
Nina Simone
Sister Rosetta Tharpe
Link Wray
The Zombies
Rock & Roll HOF Fan Voting
Bon Jovi
Kate Bush
The Cars
Depeche Mode
Dire Straits
Eurythmics
J. Geils Band
Judas Priest
LL Cool J
MC5
The Meters
Moody Blues
Radiohead
Rage Against the Machine
Rufus featuring Chaka Khan
Nina Simone
Sister Rosetta Tharpe
Link Wray
The Zombies