I'd go with Scratch, some points regarding it.
- It's a graphical programming language. It isn't text based (this might be
positive or negative). It does make it more intuitive and easy for kids (7 and
up).
- It's actually highly object. The objects you write these graphical scripts have the code attached to them and can be reused and moved around.
- Very Important: quick and impressive results. Kids need to get going fast and get results in order to get hooked.
I'd like to note that although many of us started programing at a young age in basic or logo and because programmer later in life doesn't mean those are good languages to start with. I think that kids today have much better options, like scratch or Alice.
Text based languages (python, ruby, basic, c# or even c) are dependent on external libraries and tools (editors, compilers) while something like Alice or scratch is all inclusive and will teach kids (not aimed at teens) programming concepts. Later they can move on and expand their learning.
