I'm looking forward to the SourceMap (SMAP) [See: http://www.infoq.com/news/2011/08/debug-languages-on-javascr... ] extensions, which will help developers debug CoffeeScript, IcedCoffeeScript or any other possible meta-langauge built upon JavaScript. For me, I'll continue writing what I need in CoffeeScript and always keep in mind the ASI problem—and avoid idioms that use it.

I don't much like the implicit function invocation feature of CoffeeScript so I always include parenthesis to explicitly indicate my intent to invoke a function.