I was looking around trying to find a cute little toy synth. I had the microKORG but just didn't like it so I thought I'd look at the Yamaha CS01. First I found one for sale HERE and then I found a free VSTi HERE.The Yamaha CS01 is a very cute little synth. Not the most powerful synth in the world having only 1 oscillator, but it can be battery powered, it's very simple to use and has a built in speaker. It'd be great for simple basses, leads and synth FX... cool little synth and sounds very analogue.
You can listen to it HERE (via sequencer.de)
and HERE (via vinatgesynth)