AVR-Chat

On the schematic:
- The 7805 wants a ceramic cap (100-330nF) on the input side to reduce the chance of oscillating
- The general rule of thumb is one 100nF bypass cap per power pin on each IC
- Aref should be connected to a 100nF cap to ground, not Vcc
- Stylistic note - you should not have any 4-way connections on the schematic (like either end of R3).  They make it hard to catch inadvertant connections or missing ones where nets cross
- I would add a 6-pin ISP header, just in case
- You may want to add a 120R resistor and jumper across the CAN bus for termination

On the board:

- Power and ground traces appear too thin.  You want them wider to reduce both resistance and inductance
- The TVS need a good ground return so any clamping current doesn't get sent through other parts
- There's a topside trace under IC5's tab.  It is too easy for that to short to the tab
- Place an obvious pin-1 indicator by the connectors so you don't have to keep flipping the board over to find the square pad
- Some board houses don't like having silk screen on solder pads

/mike