I know it looks a little chaotic in that picture; some of those threads are waste/away knots.
That's the beginning of Vanitas Still Life by Pieter Claesz.
http://www.scarletquince.com/scale.php?pat=CLA002" target="_blank" target="_blank" target="_blank" target="_blank
I'm doing the 'strict' version -- for lack of another name -- of parking in which I never leave an empty hole above a stitch. I'm leaving the needles threaded for speed and sanity (I think I'd go nuts having to rethread the needle for each stitch.) I use two colored markers for marking progress on the chart -- one color for marking off completed stitches and one color for marking where the parked thread is. So far, I've had 11 needles going at once, which isn't a lot, I know, but it's 10 more than I've had going before.

At first it was a little slow while I got my footing. It didn't take very long to train my eye to see the flow in the chart, however, and now I'm moving along at a pretty good clip. It's faster and the stitches are neater than doing it cross-country. I'm a confirmed parker now.
