Picaxe breadboard adapter
Very handy device. Just a small board with a picaxe serial socket and two resistors; (so it wont be hard to make one for yourself)
With the jumper you can configure this thing to match the pins on a picaxe 18 or picaxe 28/40 chip, but you can also use it for the other models. With the matching pins you stick it next to your picaxe on the breadboard, provide power (and reset-pin pullup if applicable) to the picaxe and you can program.
If you're expirimenting with multiple picaxes on a board, connect a pulldown resistor to the serial-in pin for each chip. Stick in the breadboard adapter, program your picaxe. remove the adapter and let it run. (or move to the next picaxe)
You can find it here in the picaxe store.