For people that are unsure about the success of BTC (and don't want to or aren't able to invest much in buying coins), but would like to see it succeed, here's what you can do to help bitcoin:

First, don't ever sell bitcoins on the exchanges.  Instead, look hard for ways you can spend it on things you need.  There are several market places that are already operational and there are various goods and services that people are willing to provide in the marketplace forums.  People will even let you pick things on amazon or barnes and noble, pay for them in BTC and then ship the goods to you (I've done this myself before).

And, when you need to buy something, always ask yourself first whether you can buy it with bitcoin.  If you can, go buy some bitcoins from an exchange and then buy the product or service using bitcoins.  It may be a bit of a pain right now, but it's getting much easier and the selection of goods much better.  And enduring a little bit of hassle in the short term will go a long way to helping bitcoin succeed (and help make it much easier to use in the future).