All available dates are listed on 1oita's Jimmy Kimmel Live page. To request tickets, simply register on 1iota.com, choose the date you wish attend the show and you will receive an email letting you know if they are able to accommodate your request.
Unlike Oprah's show, there isn't a long wait for tickets. According to 1iota.com, there are still tickets available for tonight's taping.
In addition to studio audience tickets, Jimmy Kimmel Live also offers free tickets for their indoor and outdoor concert series. These tickets tend to go faster than the studio audience tickets depending on the guest, but if you're lucky enough to score one you'll be able to see that night's musical guest perform live on the show's indoor (or outdoor) stage. Tickets for the concert series are also available via 1iota.com.