While I blame them for planting the annoying Vangelis theme song in my head, Chariots On Hire gets credit for an interesting idea: They'll rent you a stroller for 2 weeks to 6 months or more, either to let you test drive it for purchase or to meet a short-term need.
They have some tempting chariots, including Maclarens and the new Stokke Xplory.
The chariots have to be on hire for pretty cheap for it to be worth it. We got a Maclaren off eBay for about $200; if a rental costs that or any less for, say 6 months, they're looking at less than $9 a week.