Ted Bunn (a cosmologist) has written an interesting blog post following up on papers he and others have written. You can find it http://blog.richmond.edu/physicsbunn/2009/12/02/interpreting-the-redshift/". While this is probably not a good place to start if you want to learn about the expanding Universe from scratch, I do think there are some very important points made that anyone wanting to go the next step, and get to grips with cosmology beyond the 'party supplies' level, should understand. The basic idea is that while the 'balloon analogy/expanding space' type analogies have their use, they also have siginificant drawbacks, in terms of engendering confusion about how to interpret recession velocities and other issues. Bunn certainly doesn't argue that this analogy has no use, but points out that insisting on using this alone, or insisting on physical truths derived from it must hold are dangerous. I'd stress, as does Bunn, that this is a question of interpretation only, but none the less an important question.