I have had a package of those 4x6 cm pcb boards with 0.1" spacing for a while and realized this evening that I was about to run out. They are a good and useful size. Wondering where they all went I rummaged around and found these and there are more scattered about in various enclosed projects.
I am in the habit of soldering one up if it is on the breadboard and I think there is a fair chance I might use it again. I like to do this even when I am going to have PCBs fabricated. From top left and going clockwise they are a RFID BoosterPack reader, a Nokia 5110 BoosterPack, an INA125P BoosterPack paired with a strain gauge, a breadboard BoosterPack, a MSP430G2553 Prototyping Board, and a MSP430G2955 Prototyping Board. The G2955 is a 38 pin TSSOP so it is on an adapter. The latest one is the Nokia 5110 I put together this afternoon.
I had the idea that SMD parts might be directly soldered to these boards. Here is a 0805 resistor soldered onto a piece of scrap (crooked but OK) with a SOT-223-4 part next to it. The SOT-223 isn't soldered, I just put it there to show it aligned fairly well. I ordered an inexpensive selection of 0805 resistors and capacitors and will be using them instead of through hole components to see how they do.
Meanwhile, I haven't given up having PCBs fabricated, but this is handy. What I really need want is a CNC mill.