I love Project Euler. Each time I pick up a new language I actually go to PE and solve some problems (often times ones that I have already solved) just to get a

I love Project Euler. Each time I pick up a new language I actually go to PE and solve some problems (often times ones that I have already solved) just to get a better feel for the syntax of the new language I am learning. Afterwards I'd just go make some standard 'mock projects' that require a bit more of software architecture. Such as building Game of Life, a twitter clone, a HN clone,.. Depending a bit on if I actually liked the language :-)