There are ways to get on Google+, the ubiquitous search engine's foray into social networking, if you haven't snagged an invite via the circles share exploit, which is working intermittently right now.
The first way is simple, as long as you have an iPhone, iPad, or iPod Touch nearby.
In Safari on Apple devices, just point your mobile browser to plus.google.com.
If using a Mac, set Safari's user agent as mobile version. Tap on Sign In, and then you will be presented with a Sign Up form to join Google+, which prompts for your name and gender.
In my tests, I was able to join Google+ with a regular Gmail account. Note that once you sign in, you may be redirected to the mobile version of Google Buzz. If this is the case, just login with the credentials you just created on your mobile to the desktop version of Google+ on your PC, and you should be ready to roll.
Google is constantly plugging holes that people exploit to join Google+, as the service is currently at capacity. So if the first method didn't work for you, there are two other hacks that you can try.
Try using Google's Chrome browser and downloading this Chrome app, as first pointed out in HackTabs. Once installed, click on the Google+ icon in a new tab and you will be taken to the login page, where you can sign up for the service.
Sound off on whether these methods to circumvent the Google+ invite process worked for you.