I read through it and couldn't find anything that really applied to us, quote something if you think it's relevant.
In general I'd suggest you read this blogpost I wrote a while back, it goes a little into the whole static thing. Dan also wrote a bit about it in his "Why did you do that?" blogpost.
On the whole I'd say that there's nothing wrong with using static methods instead of function for utility methods that don't need an object state to work, the reason for that is that it groups them and makes them autoloadable - thus saving you from having to import everything you (might) need.
But far more important: anyone who says we're mostly static is ignorant or simply lying. We offer static access to many things, but almost everything even remotely complex works with instantiated objects. That we made access to them easier through static means in some cases doens't mean you have to - just create the object and work with it if that's what you prefer.
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