@Max...I have thought of doing that myself, and in fact used something similar when I was playing with my big VF display, which takes 1.4A max. But for development work I prefer having a supply limited to about 1/2 Amp - even less sometimes - that way if I do something silly (which happens not infrequently) then the chances of permanent damage or letting the smoke out of something are a little reduced. The 78M05 limits at 0.5A or you can even use a 78L05 which limits at 100mA. I am working (mostly in my mind at the moment I will admit) on a breadborad develoment system - pluggable breadboards and +/-12V and +/-5V power rails, but might think about having various current limited supplies available (maybe even a variable limit on the +5V using the good old 723 regulator). That way, with my clumsy fingers and addled brain, I will have less chance of frying expensive chips... :-)
@David: ...are very good for is to put next to a breadboard for connecting power...
I've started using a 10A switched mode 5V power supply that's really well regulated -- I have four power leads coming of fit each with a 2.1mm male plug on the end -- I can plug these directly into an Arduino -- or in th ecase om my breadboards ech I connect the breadboard to one of those 2.1mm female connectors with two screw-terminals -- so then I can just plug one of my flying power cables into this -- it make slife really simple :-)
"The electrical simplicity of the connector belies the complex mechanical design needed. The contact itself is a tradeoff between mechanical strength, conductivity, clearances, corrosion resistance, gas tight, surface area, regulatory requirements, pressure and vibration resistance. The last item is often covered by a patent. Take a look at the 13th page of this document in the section marked "The principle of vibration resistance".."
As an aside, one thing the spring-clamp type of terminals - especially those not requiring a TFS to operate - are very good for is to put next to a breadboard for connecting power or signals. They make connecting them a pleasure, and you are not tied to having a fixed arrangement. You can use speaker terminals for this as well, but they are usually a lot bigger - which can sometimes be an advantage if you have five thumbs on each hand like me.
I think you were right to go with screw terminals -- they're handy for prototyping because you can pretty much stuff anything in there (of various sizes and amounts) and get them to work, at least for a while (I always tug on both wires if I'm connecting two wires to a screw terminal).
Pretty much all spring clamps will work with stranded wire, but you have to open & close the spring, with a screw driver (which needs to be appropriately sized - and sometimes it's tough to hold the board, use the screw driver, and insert the wire), with levers (which can take a bit of force to operate), or possibly something else, depending on the particular model.