Packet radio, HAM, CB... it is all a mystery to me. Is there a beginner's guide somewhere on getting into this field for cheap?
When you're studying for your license, use my HAM Radio study guide for Android (https://market.android.com/details?id=com.tango11.hamstudy...). It's free and there are no ads; just something I did to give back to the community.
Something to consider, if that is accurate.
This is the spirit that made HAM Radio a success in the first place. I wish more of it would be still present.
Out of the same motivation, I have developed an open source APRS app for Android (http://aprsdroid.org/) written in Scala. It is available (for a fee) on the Market as well, but you can download the APK freely from the home page. :)
Of course, I'm not a huge fan of xastir. At this point, I want to build something new that's not GUI based and see if I can get something that's more useful outside of vnc.
See if a local library has a copy of the ARRL Handbook. There's also a ton of information available on internet. Many hams have blogs, projects, etc available to explore. Sometime back issues of Radio and ham magazines are freely available. http://www.ae5x.com/blog/tag/oldpubs/
There's a large number of kits and other projects that are simple and inexpensive to build. You can spend as much or as little as your budget allows and still have a blast. I've had a nice PSK31 chat with the US East coast from Texas with 3 watts and a simple wire antenna while car camping.
I'm hesitant in telling you to seek out a ham radio club. There's a bitterness among a small percentage of older hams that has discouraged a legion of folks from enjoying the spectrum. But with the internet, you can usually ignore these idiots and find some aspect of radio/electronics and communication with like folks.
http://www.arrl.org/new-to-ham-radio
They provide a wealth of resources. Keep in mind that most larger cities around the world also have ham clubs. Most have regular classes to help you get your license.