Testing is going well

I'm currently running a test sketch that is a server, client, logs to SD card with time/date from RTC. I'll let it run for a couple of weeks and just see how it goes.
The radio system was tested with Maniacbug's RF24 library and after assigning the pins it worked straight-away, reading the key-presses from a Nordic keyfob.
Running from just 3.3V is a good idea. I thought about it early on and figured that I could just feed it with 3.3V externally and link out the 3.3V reg.
It makes more sense to keep the reg and put some kind of link/jumper on the PCB so that the on-board regulator is always used.
Its a linear reg so pulling too much current will make it hot quick, and the one I used (MCP1826) has a absolute max input voltage of 6.5V. While running my test sketch, it is slightly warm to the touch, no heatsink and a 5V i/p.
Running everything from a 5V plugpack through the reg should be fine, but only testing will tell.
The regulator has a very low quiescent current and pretty low dropout so its reasonable for battery use if the micro is in power-down mode to conserve energy. The Wiz820 power-down is connected so it can be shut down in power critical situations that require ethernet.
There is a drop-in replacement RTC that runs on 3.3v (DS1338) and also RS485 chips for 3.3V so the whole board functionality will still be available, which is a requirement for my intended uses.
So far I'm happy with the results.
I need to make up another couple, one at 22.11Mhz and one running at 3.3V, 16Mhz so I can try things.
And, where does all the time go.... ?