I have a lovely new thing in my life. My Traitor single speed. It's everything a new bike shouldn't be; it's steel, it has one ring on the front (a nice 46) and another at the back (an 18), a Brooks saddle, Brooks handlebar tape (that cost more than the handlebars), heavy Salsa cross wheels built by my mate Craig and all told, it weighs a flippin' ton.
I love it. Hills are hillier, legs are hurtier and life is lovelier. I bought it for use as a time machine, compressing several hours training time into one or two hurty ones. Ask me if it works in a years time.