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The Balloon Analogy on PF

Here's a JAVA-based moving model of the expansion. I don't care for it myself but it is highly regarded by some and is often linked to in answering questions about the balloon analogy and/or the expansion of the universe: Ned Wright's Java-based model

And here is an excellent discussion: Misconceptions About the Big Bang

A couple of other good ones:

a brief history of cosmology --- two pages on your computer screen

a history of cosmology theories from the Greeks to now --- a considerably more extensive discussion

Sean Carroll's Cosmology Primer --- an extensive discussion

errors in some popular attacks on the big bang --- may dispel any misconceptions you might have