JS semicolons are actually encouraged —omitting them, while syntactically valid, can lead to obscure bugs. http://bonsaiden.github.com/JavaScript-Garden/#core.semicolo...
If you are following Crockford (JavaScript, the Good Parts), it is encouraged. However, some, like the current node.js maintainer think otherwise; see http://blog.izs.me/post/2353458699/an-open-letter-to-javascr...
Personally, I still follow Crockford's advice though.
And you guys just demonstrated yet another reason why I choose Python for my go-to scripting language. Semicolons are completely redundant in Python and the language is so clean and the style guide PEP 8 is so natural, you rarely hear about these meaningless formatting style bickering in other languages. Saves so much time from arguing.
I hear you about Python, but JavaScript doesn't require semicolons either, as far as I know. The main reason it's advisable to put them is to avoid ambiguity when 2 statements find themselves on the same line, for example, in a minified js file. Python uses semicolons for the same reasons, but minifying Python files is quite uncommon (and would probably serve no real purpose).