> In the socket will fit a 28 pin DIP holder for my PIC 16F886 or 18F2620
>
> Is it an OK design? Can anyone spot anything wrong? Are the traces too thin?
>   
A few comments.

(note: in this post as is conventional in the PCB industry mil reffers 
to a thousanth of an inch)

You have two traces between a pair of pins, this is best avoided due to 
the very small tracks and gaps required. You can fix this by moving the 
trace from pin 15 of the pic to come out one pair of holes lower. Then 
taking that trace through the connector and joining to the connector 
round the back.

When taking a trace through between a pair of pins make sure it is 
centered and try to roughly match the track size and gap size.

Also while a trace will have to be relatively small (12mil or so) to get 
between dip pins that doesn't mean it should spend it's entire length at 
that size. a 24mil track is much easier to wiremod and likely to etch 
much more reliablly than a 12mil one so widen up to 24mil as soon as the 
trace gets out of the cramed area.

As others have said here right angle corners are more prone to etch 
problems than 45 degree ones so try and mitre your corners whereever 
possible.

> This will be for homebrew PCB making by the way (using toner transfer
> and FeCl etching).


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