To me hiring a professional for 20 minutes might sound enough for some small taske, but I'm not sure how well this goes for more complex tasks (e.g. where the pro has to read and understand your code). I guess you can buy couple of chunks than but I'm not sure I see the benefit. Is it just so that you don't have to pay every starting hour?
Great work man! What I think it needs next is some sort of cursor indicator - preferably with some sort of user id. Something similar to how Google Docs did it. Keep it up!
From the article itself I couldn't agree more on "The ultimate resume". A passionate developer with a lot of cool tiny projects (as his playground) can get plenty of job offerings - as long as the ideas show potential and are executed well. Also, as Sahil mentioned, one of the projects can start small but grow into a big successful business.
As others said above I'd also suggest you try out pair programming (with a friend of yours). I find myself more relaxed when I'm with someone I can talk to, make jokes or just bitch about the things not working. When I feel stressed I change place with my friend and he continues with the code while I calm down. Also he might see mistakes you don't and helps you fix them right away avoiding the stress.
Another good strategy is to break everything down to small tasks. Tasks you can do in 30 minutes or less. Watching the list getting shorter makes you feel like you're doing something. I think this is part of the agile approach.
To summarize: they didn't have a sustainable business plan and when the costs got too bit they canceled free service. They say now that they're better prepared.
Like justinchen said they already offered free SVN and GIT hosting. Then one day they sent out newsletter saying that they're not providing free hosting anymore and that all repositories will be made public. I had to move all my projects to another repository and promised myself never to go back. I don't trust them, sorry!
P.S. Good luck with DubJoy ;)