There are some interesting investing methods in this thread. Im not sure what a good investment is personally, but Bitcoins alone may possibly be a good investment on their own, in my opinion.
The best investment is creating a new service (using the bitcoins for advertising/marketing/development). This strengthens the economy and there are still tons of niches where you can get in on the ground floor and be the first to market, giving a very strong advantage over competition later on.
Agreed. There's high incentive in accepting bitcoin. Being a early adopter in doing so will attract a new audience.