Almost all start-ups run into limitations in two critical areas - time & money. You can never have enough of either. Technology is supposed to help you save a bit of both, but it always seems to end up taking more time and more money than it ever saves you. Even when you find a solution that saves you money, it almost always takes more time than you have to give, and vice versa. What choices are available to help swing things back in the intended direction?
Open source tools are free, but expensive in terms of time lost to implement. There are free web services available that allow you to utilize their capabilities - sans your own branding. Gmail is great, but how long can you get away without having your own domain associated with your email? Same goes for free wikis and other collaboration tools.