Chris Pirillo asked the question, "When people ask you about your first computer, what do they mean?"
Most of my best programming experiences revolved around typing in games out of program books and then motifiying the code to make the games play better. I still remember staying up to 6:00AM typing in a Star Trek program out of a book only to be disappointed with game play. I eventually re-wrote the game for faster game play, additional fire and movement controls. These coding experiences really got me hooked on programming and playing with computer systems.
I had some good times programming games on that machine. The only thing I really hated was backing up to cassette tape.
Eventually I purchased the 16K RAM expander and the thermal printer for my 1000. I think I paid around $50 for RAM expander.
I still have my Timex Sinclair. I just can't seem to part with it.