A free trial is good for people to find the values of your product. However, whether 3-month trial is good or not depends on your product. For product which value will not increase with time, the longer trail will not increase the conversation rate. I think you can test the different trial period to see how it works.
It's not good to "charge from day one", but maybe it's not bad to think about "ask for CC info from day one". It will stop some users to use your product but will bring more serious users.
Pragmatic.ly is a fast and easy to use project management tool featuring real time collaboration. We have shared the background and thoughts on this new tool on http://blog.pragmatic.ly/hello-world. Thank you very much for the review and your feedback is highly appreciated.
I'm using CloudApp for most of the sharing and then Dropbox for bigger files. I really want to recommend Papers. It's really nice and keep me away from the documents explosion.
It's not good to "charge from day one", but maybe it's not bad to think about "ask for CC info from day one". It will stop some users to use your product but will bring more serious users.