Here are a couple of examples of how easy it is to make projects on a breadboard with these.
I rather like the idea of using a WW socket and putting components on the board UNDER the socket as well as using the socket pins themselves for plugging into the next "layer" of circuitry.
VERY nice thing.. any chance it will be buyable one day?
It's not difficult to solder (no SMD). If there's enough interest, I could do a run and put together some kits. Anyone else interested?
i'd be happy with the PCB alone...
It's designed for a pretty specific list of parts. If you don't get the same ones, they likely won't fit, especially the caps and resonator under the chip, and the leds on the bottom of the board. Some of these clearances are less than a millimeter. I could give you a list of part numbers, but if I'm going to distribute the boards, distributing kits of parts to go with them will make things easier for everyone.
I got the extreme-closeup problem solved. Now you can see how bad my soldering is... and that I accidentally soldered the sockets in backwards. Here are a few more photos (I was having fun playing with my new toy):
Nice pictures. I mean, not breathtakingly beautiful, but plenty good enough to show how things are set up, in ways that weren't obvious on the lesser closeups... Useful! Good work.
For those interested in the circuitwriter work in the earlier versions, I've got pictures of those in this thread: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1243965932
I'd definitely be down for a kit or two!
I got some new boards in, but I can't assemble them yet because I ran out of sockets. I've got some on the way, but until then I thought I'd show off the bare boards.
At the top is a board with built-in usb. I made a mistake on this one that I didn't notice until after I sent my order, so I had to cut a trace in a couple of places. This board also had some slight manufacturing defects in the solder mask, but nothing that should affect functionality.
The next one is like the last version, but with icsp added and a bunch of cleaning-up done to the trace routing and silkscreens.
The last one is a mini version. Like the very first one I made, it is designed to be powered either by the ftdi cable or an external regulated supply. This one is even even smaller though, at about .66 square inches.
Each of these also has a solder jumper so that auto-reset can be disabled.
nice boards 
You are making good progress with these boards. I like the idea. If you want to see what is possible with SMD parts, check out my own om328p with Arduino bootloader.
Mike Perks
OakMicros.com
These are just awesome! I'm completely sold on breadboardable *duinos. Looking forward to getting more access to the rows than what iDuinos and Boarduinos offer. Curious if you've consider a jumper header for getting power to the rails instead of running two leads, to further free up breadboard space.
A jumper header? I'm not sure how that would work, but it sounds interesting. Can you explain what you have in mind?
Oh, did you mean something like this?
You could certainly assemble any of them (except for the super-tiny one with no onboard power regulation) with male or female headers facing up. With long-lead headers, you could do that and still connect them to the breadboard.
Yes, something like that-- a way to get power to the rails without using up rows on the sides, freeing up a few rows adjacent to i/o pins for whatever is needed; maybe not that useful...
Here's another project I made with it:
I'm looking for a way to replace the resonator with a crystal, but space is very limited, and I need to add capacitors with that. I'm playing with some SMD designs, but I really want to keep this one purely through-hole (I've also decided to stop working on the usb version). I'm thinking that a cylindrical package could work, but I can't find any that are less than 8.8mm long, and I only have a clearance of ~ 7mm. Anyone know of a 16 mhz cylinder crystal that's shorter, or know if it would be a problem to mount it at 45 degrees, or laid flat above its capacitors? I've never used one before, but what I've read suggests that they're more sensitive about their environment than other components.