What are your thoughts on having many webapps each responsible for one task?
What I am concerned about is the fact that small businesses (the target market of 37signals and other such companies) must subscribe to at least 3 or 4 different apps (perhaps from different vendors) to meet their otherwise uncomplicated requirements.
This may amount to a quite high monthly fee if all subscriptions are added together. Sure, the makers of such applications don't really see this ($20 a month per client is not much) but for the small business is a small fortune when added up (~$150). Despite this, it seems to me that this way of doing business (sell many different apps to the same company) is working well.
My guess at the moment is that it depends on the application and whether the target business can afford to not use it.