These are links to projects/articles using RTLSDR to hack RF signals:
Hacking fixed key remotes:
http://andrewmohawk.com/2012/09/06/hacking-fixed-key-remotes/
You can ring my bell! Adventures in sub-GHz RF land
http://adamsblog.aperturelabs.com/2013/03/you-can-ring-my-bell-adventures-in-sub.html
RTL-SDR: 433.92Mhz ASK/OOK Decoding of Various Devices with rtl_433:
http://goughlui.com/?p=5395
Decoding radio-controlled bus stop displays :
http://www.windytan.com/2013/11/decoding-radio-controlled-bus-stop.html
Receiving GPS and Glonass RAW data using RTLSDR:
http://michelebavaro.blogspot.it/2012/04/spring-news-in-gnss-and-sdr-domain.html
Hacking TI eZ430 Chronos watch protocol with RTLSDR:
http://geekdistillery.blogspot.com.br/2012/12/a-cheap-ti-ez430-chronos-watch-to.html
Reading a smart meter using RTL-SDR:
http://bemasher.github.io/rtlamr/2014/02/08/innards.html
RTL-SDR : AFSK modem between two linux box:
http://www.kprod.eu/blog/?p=26
ViewRF software – RTL-SDR Spectrum Analyzer for BeagleBone Black:
http://robotics.ong.id.au/2013/08/25/viewrf-rtl-sdr-spectrum-analyzer-for-bbb-software/
How to Make a $19 Police Scanner:
https://sites.google.com/site/policescannerhowto/
RTL-SDR Tutorial: Cheap AIS Ship Tracking:
http://www.rtl-sdr.com/rtl-sdr-tutorial-cheap-ais-ship-tracking/
Track Airplanes with RTL SDR and ADS-B! :
http://www.richardosgood.com/blog/2014/01/14/track-airplanes-with-rtl-sdr-and-ads-b/
Sniffing and decoding NRF24L01+ and Bluetooth LE packets for under $30:
http://blog.cyberexplorer.me/2014/01/sniffing-and-decoding-nrf24l01-and.html
Using a RTLSDR dongle to validate NRF905 configuration:
http://www.embeddedrelated.com/showarticle/548.php
Receiving and Decoding Tire Pressure Monitor Systems using an RTL-SDR:
http://www.rtl-sdr.com/receiving-decoding-tire-pressure-monitor-systems-using-rtl-sdr/
The big GSM write-up – how to capture, analyze and crack GSM? : (part 1 of 4)
http://domonkos.tomcsanyi.net/?p=418
Analysing 433 Mhz transmitters with RTL-SDR:
http://arcanumx.com/?p=44
Messing with 433MHz equipment:
http://www.kukk.org/blog/sdr/messing-with-433mhz-equipment/
Alan C. Assis 