A few years ago while we were in the process of renovating our current home, I took the initiative of learning a bit about alarm systems so I would be able to wire/install our current alarm. At first it was a daunting task with little explanation to be found online; but after a while it became as easy as network cabling- and that is when the fun begins.
Initially I purchased a DSC Power 832 system from eBay as it is a reliable brand, lots of upgrade options and cost effective. I wired up the 8 zones, did the basic programming and had an alarm company come in and enter in their dial-in information for monitoring.
There are tons of options for the DSC Power 832 system- such as the PC5108 hardwire zone expansion, the PC5132 wireless zone expansion, wireless PIRs/smoke alarm/window contacts, and wireless arm/disarm keys.
A few weeks ago I saw an application called 'DSC Alarm Monitor' on the G1 App Store and downloaded it out of curiosity. From this program I learned that there are newer IP expansion modules for my system- such as the DSC TL-150- that can act as a virtual keypad: basically allowing me access to any entry/information that my wall-mounted keypad can do. (There are also more advanced modules such as the TL250 and TL300 that will email alerts- but these cost at least twice as much as the TL-150)
Installation for the TL-150 took about 15 minutes; one CAT5 connected to my switch and four wires from the module to the KeyBus and it was done. DSC thoughtfully included plastic stand-off holders that fit into strategically placed holes on the DSC cabinet- making it an almost tool-free install (save for the small screwdriver to tighten the terminals down on the wires).
I made a custom port-forward in my router, setup the G1 DSC Alarm Monitor and I am now able to arm my alarm from inside my car! :o)
The G1 application also allows me to check the status of the zones (door last opened 7 minutes ago, etc) and receive notifications if the alarm is triggered.
Similar information is available from any web page via an integrated web server on the TL-150.