Time for a major technology refresh.
Most of what I usually do isn't very demanding so I tend to keep computers for a while. However, with the number crunching and Monte Carlo simulations I'm anticipating on running for my PhD project, I need something that will be able to handle it.
The new computer isn't quite as high end as I would have liked, but it's still pretty decent and more state-of-the-art than any other computer I've ever had. Core i7-930, 12GB RAM, 1.5 TB storage (500 GB and 1 TB drives) and nVidia GTX 260 video card.
After the new computer arrives and gets set up, the old computer will likely live out the rest of its days in quiet retirement as a file server.