A comparison chart of features against competition (both web and non) like Billings, Harvest, Ballpark, and other services (http://en.wikipedia.org/wiki/Comparison_of_time_tracking_sof...) would be useful.
We're very light in the marketing part of the site at the moment. Would you rather see a feature comparison or a short product demonstration video?
We've got some ideas up our sleeve for mobile and desktop innovation, but thought we'd build the web side first as (we hope) it's useful as a standalone product.
What do you love most about Freshbooks?
What would be a cool feature, is if you could use the gps as the timetracker. You were at the location 10 hours, how many do you want to bill etc.
Just an idea :) Simplicity is nice, but lots of your competitors have that already. What sets you aside?
Something else that we haven't seen is better browser integration - some kind of bookmarklet that gives you a timer whatever site you're on in your browser. This would be good for web developers and other users that spend a lot of time working in the browser. What do you think of that idea?