Google launched templates for an assortment of wedding planning documents. I haven't looked at them too closely, but there's a budget (of course), schedules, address lists, etc. I might be interested in using them b/c they'd be available all the time online...the bummer about our budget is that it's on my computer at home.
I think you can put any document into Google documents, though. I should check that out. It sounds better than re-doing our poor overworked budget.