Arduino
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I've done a couple small arduino projects and one pretty large one (a 32/16/dual 8 step voltage controlled sequencer). If you can write basic objected oriented php (or better yet have wrote C++) it's a breeze. Any led based projects are easy as they usually only require a 220 ohm resistor.
The complexity is adding other microchips like multiplexers, shift registers, DAC's (digital to analog converters) and other stuff like this. That learning curve is quite a bit steeper if you don't have any experience with that serial communication sending stuff one bit at a time. I spent many nights scratching my head reading data sheets, adjusting circuits and trying to figure out how to program these fucking things. Although, once you get the basics down, you soon realize all of these chips work the same way. In all honesty, without learning how to use other microchips with an Arduino, you will greatly reduce the number of projects you can do.
Here's a shift register I use in projects: http://search.digikey.com/script…
The thing to pay attention to is the truth table. Yeah, it looks crazy. But, the truth table is really the main thing to pay attention to.