1. Mixpanel vs. Kissmetrics: Mixpanel gives me a free account that I can use for as long as I want to evaluate all the stuff I can do with it. KM gives me a 14-day trial. I'm the only developer working on this project which means that 14 days is not enough time to implement the changes I need and actually start to see the results. Going with Mixpanel for this one was obvious. I will reach their free 25k data points way before the first month so I have to get a real paid plan or put a banner on my website. In any way, they won already. Even if I wanted to switch to KM for the lower prices, exporting the data I currently have would be a hassle.
2. The New Basecamp: Although they don't offer a free plan anymore, they do have a 60 days trial. They don't really lose much by offering those extra days and after two months I'm already hooked to their service, I know how everything works, and most importantly, they have my projects tied down. The work of those 2 months is already there so even if I don't like the product, I'll probably pay for it so I don't have to export it. Joel Spolsky has a great article that talks about this retention thing (his specific example was with email providers) but I can't find it right now :(