Woa... thread revival!
I just had to post to this thread, no matter how old it is, because it just so happens that freediving and wingsuits are two of my favorite things! I was doing a Google search for something about wingsuits and saw a DB URL in the results and flipped out to find out that wingsuits had been discussed on these boards.

I've been flying wingsuits for two years now and have met and jumped with Jari, the owner of Bird-man, who was mentioned earlier in this thread.
Last summer my favorite thing to do was go make a few jumps on a Saturday in DeLand with my suit (20 minutes from the famous Blue Springs), then go freedive Blue Springs at sunset. As I was sinking vertically through a very narrow rock channel, using my body position and fins to follow the "S" shaped contour of the vertical drop, I remember thinking how I was doing the same thing with my body in the air just hours ago (controlling glide angle), and wondering if anyone could possibly understand this comparison! I actually have met one other very accomplished wingsuit pilot who says he used to freedive way back when but isn't interested anymore. Both such small sports, it's hard to find someone who does both!
And Pez (hi Mike), that rock-luger thing is a cool idea, never thought of that.
Although I will say, I have been following the "subsurfing" threads recently with a lot of interest as that sport seems to combine ALL my passions (freediving, skyflying, and surfing). The few good pics I have seen of someone in a good subsurf position look REMARKABLY like a skydiving "track" (horizontal motion without a wingsuit). Before I was able to fly a wingsuit I loved tracking dives. Basically you pull your arms in to your side, legs together, de-arch at the hips and shoulders (roll your shoulders forward) to create a shape with your body similar to a classic airfoil. Without a wingsuit, skilled trackers can reach 1:1 glide ratios (about 90mph:90mph). With a wingsuit, dependent on technology, skills, and body type, glide ratios of 3:1 (about 120mph:40mph) are possible, though not common. Picture of subsurf/track position
here (sorry, can't find a good one in the air).
The coolest thing about the wingsuit is not the max glide, it is that your glide (and heading, and everything else) is controlled by your body, so you can fly (almost) wherever you want. I regularly pick out cars on the highway and race them, and they never win. rofl But by far the coolest thing to do is swoop clouds. You can fly over, under, around, and through clouds. It's best if you find a big puffy one with a hole in the center and dive through the hole.

Or a big tall one, and just stay next to it as long as you can so you have a good visual speed reference. If there's a big tall column-y cloud you can just fly circles around it as you descend.
Attached is a pic of me flying my wingsuit (blue/white). There are also quite a few great videos edited by a friend of mine named Omar that you can get for free off of skydivingmovies.com. You'll have to register for the site, but it's worth it if you're interested... go into the wingsuit section and check out any video with "Z-Flock" in the title (these are the group of guys I jump with). The one with "big fat clouds" in the title has some great footage of cloud swooping, but unfortunately I'm not in that video.
Ok, I'll end my rant now. Not sure if anyone is interested in this post, but I love talking about wingsuits and I figured next to skydivers, freedivers are the most open-minded people out there so maybe this will catch someone's interest and eventually we'll have another one join the darkside we like to call "nylon crack." Be prepared, it is VERY addictive.
