There are all sorts of interesting start ups coming online all of a sudden, in restrospect a few years from now it will probably be coined dotcom 2.0.
One that caught my eye is Ponoko. An interesting model where you design something real and they will manufacture and sell it for you, sharing in the profits.
Kind of an extension to the CafePress idea for tea shirts.
To me there are three major types of dotcom 2.0 start ups around at the moment.
1) Capture the Eyeballs
Sites such as Youtube and Facebook, who are designed to capture eyeballs, operate at a loss and then when they are larger enough get sold to an advertsing centric company (such as google) who can convert the eyeballs into dollars.
2) Revolutionise current technology
Companies such as Salesforce.com , PlanHq and Xero who are changing software solutons from being expensive purchases you install on your PC/Server to being affordable subscriptions, with no maintennce efforts/nightmares.
3) Revoluionisecurrent business
Companies such as Ponoko who take a business process (for example, designing a products, getting short run manufacturing, creating a website and then selling your product) and automates the process using web based technology.
It will be interesting to see which model is still around 2 years from now.
