Cashed out of HAL at $7.07 (think I put in 10 mil at $1.7 and another 10 mil at 4.6). Too risky for my tastes now that people are organized.
Going to consider taking part in the insider trading at /r/GTAVstocks but I have a feeling it's going to be messier than they expect. They have a scheduled selloff on Monday for Pisswasser, but I imagine the hours leading up to that are going to be absolute chaos and anybody who actually waits for the scheduled time is fucked. I'll be waiting to buy into whatever their next choice is as soon as they announce it (might try to predict it -- so far they just pick whatever's lowest), but I'll play it safe and sell it as soon as I see a good return.
But I think I like BurgerShot best so far. No community to muck it up. Buy at $3.XX, sell at $5.XX (or high $4.XX) -- decent return, predictable. I've done that several cycles so far no bruises yet.
I'm also considering investing in prep for GTA:O (stuff I imagine players will be buying in-game, mostly weapons) but it's hard to tell if player activity will have as big of impact as trading activity so I'm not sure how reliable it'd be.
http://www.reddit.com/r/GTAVstocks/ probably has the best info