Last Thursday, twitter was forced to withdraw its free SMS alerts service to UK users. [...] Six days later, thanks to the power of symfony, PHP, mysql and q4m, we've built and launched a replacement service called twittex.com.

The site lets you prepay for the messages you want to use. Using the symfony framework made it easy to get a system up and running quickly and easily (in six days!) to fill the gap suddenly left by twitter's decision.