A magazine close to my heart, the new issue of Open Silicium No. 7 has just been published.
On the programme: Raspberry Pi and embedded distributions, a lab that cuts through APC, Linux kernel compilation, home automation, a real-time operating system, tearing down an e-reader, and development with Verilog.
Quite a programme indeed. More than that, plenty of reasons to justify the hours you spend tinkering and to extend those hours by finding more challenges.