Hi,
Like Nigel did, I'm desgning my own (for the PIC series) and he hit the nail on the head. I've also decidede on a modular system, albeit with certain 'must haves' on the main board, power, rs232, USB connector (for bootloading/contorl) and headers, lots and lots of headers. One massive 40way socket header for attaching a piggyback board and for plugging in wires (just like your board has around the breadboard). A 10 (2x5) pin header for every port, and various 3-6 pin headers for SPI/I2C/PWM/UART etc..
I did find that board when I was googling for idea's, and it seemed a pretty reasonable price for what it is, and yes blue 7-segs are terribly expensive, probably 15UKP for 5 (27USD?) but it has the essentials and more. The best thing about it is the sockets around the BB, very handy! And you could always knock up some cables with pin headers to external boards. I'm still desgning mine, because I'm indecisive
If you're into the basic stamp jobs, and use a BB regularly with it, I'd say go for it. Although...does it come with the Basic Stamps? or would you buy them seperately? added cost... But the idea of 'modules' instead of single micro's (with ICSP connector/xtal etcc on board) did attract me for a while.
My two pence,
Blueteeth.
Ps, sorry to advertise another post, but my topic is still open...I simply can't decide on thing apart from hundreds of connectors for externals