In particular, you should watch the Crawler 1.8 Beta Video, which goes over all the new features of the latest beta.
If you want to participate in the Android beta, you must have a device that supports Android 2.2 or higher, and the ability to sideload apps.
If you have a newer device, download the beta here: Crawler Android Beta APK for Newer Devices
If you have an older device, you can download the beta here: Crawler Android Beta APK for Older Devices
(Some very old devices might no longer work, but give it a shot!)
On Windows, you can download the the setup file and give it a go. (You'll need to have Adobe Air installed on your machine to use the installer). You can download the setup file here: Crawler Desktop Beta
If you're interested in testing the iOS version, just contact me with the email you use for your Apple ID, and I'll get you set up to test through Apple Test Flight!