Open Source Community Boards

The open source community has now extended into embedded hardware.  We have seen this growing for the past few years but now we are starting to see documentation around the solutions so that even the novice can start improving their skills on these embedded processors.  A few of the suppliers I know that are popular out there are Broadcom with the Raspberry PI, TI with its line of DaVinci and Sitara Processors, Atmel with the Arduino, and now Samsung with the Arndale.  Being a hardware guy by background it gets overwhelming to have to delve into the world of software with all the jargon out there. Sometimes I get frustrated and want to throw my hands up. I did decide to pick up one of the boards and see how far I could get.  I ended up choosing TI's Beaglebone and successfully drove a 17inch display.  What I still struggle with is all the ins and outs of porting code from the target development environment to a custom board.  Has anyone found any good training, books, websites that help walk through this?