I admit that I use a commercial powdered vegan egg replacer for baking, which comes in at around a third of the calories and a box lasts for ages. (not vegan myself, but kept forgetting to use the eggs in time).
I've tried the flaxseed and water combo - it does work, but it will affect the flavour of something that doesn't already have a strong flavour. It has kind of a nutty taste.
Depending on how strict a vegan you want to be, you may also want to consider your source of sugar if using, as sometimes it is refined using charred bone.
Oh, and agave syrup is a good sub for honey.
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