Apple released iOS 7.1 beta 3 to developers on Tuesday. According to p0sixspwn creator iH8sn0w, the new release does not break the evad3rs latest jailbreak, but an unofficial version of evasi0n7 was needed to jailbreak the new beta. You can download that version here, but remember this tool was not released or sanctioned by the evad3rs and should be used with caution.
It is also a safe bet that Apple will patch evasi0n7 very soon, which means this could be the last chance users have to upgrade to iOS 7 and jailbreak their phones. Users still running iOS 6 will not be able to jailbreak once Apple closes the exploit, and there is a slim chance a new jailbreak will be released for any future versions of iOS 7.
Evasi0n7 only jailbreaks devices running iOS 7.0 through 7.0.4, which means that iOS 6 users will want to update to iOS 7.0.4 before Apple releases iOS 7.1 to the public. Once you have upgraded from iOS 6 to iOS 7, you can learn how to jailbreak your device using Windows here and Max OS X here. The Cydia Substrate was also updated to support the ARM64 CPU in current iOS devices. This means any iPod, iPhone or iPad that is capable of running iOS 7 can be jailbroken and now use Cydia apps and tweaks.