I tend to set fire-and-forget alerts surrounding the current price so I can ignore the market until a level is hit. I often re-set them, so e.g. right now I have alerts at 30500, 30600 and 30200. Below 30200 it's worth looking at reducing my position, but the other two are just useful to know. If it moves X100 points, SMS me. 1000 points, phone me at 2am :)
I wouldn't want every 15 minutes because I don't really care where it is in 15 minutes unless it's either gone up or down.
One day I'll take the time to build out all these nice toys and put them on a server.