I was thinking about this today as well and while its nearly impossible to tell if the same person/group is selling buying to manipulate the price you can sometimes see hints of this going on.
For example if you watch closely you can sometimes see a large order starting to build on the bid but it may only happen 10-15c lower as a subtle blip on the radar.
I realize that doesn't mean anything but when you see the bid placed (as anonymous for example) and the sellers start to unload at nearly the exact same time it makes me a little suspicious.

I also don't know how much truth there is to the 100-500 lot indicator system but there is probably some validity to it.
If you think of it in a different way (from the avg. poor retail investor's side) the 100 lot transactions don't make much sense.
Most people who are amateur investors are paying $30+/trade for commissions.
Why would a person make 10 transactions of $30+ to unload their measly 1000 shares? (no offence to anyone with a smaller number of shares, just illustrating a point). My point is; why even make more than 1 transaction if you don't have more than 1000 shares? Most major banks only start charging heftier commissions once you trade over 1000 shares, or the SP is over a certain range i.e.. $1-3/share. I can see a few people having a handful of shares (100-500) and getting impatient and dumping but I think its highly unlikely that dozens of them are doing it at the same time for hours on end.

Either way you slice it, if you make many transactions it just cuts right into your profits (as I'm sure most of you are aware). However major players do so many transactions their commissions are next to nothing ($2-7/trade most times), so even a few pennies turn a profit. If Joe retail is paying $300 in commissions on 1000 and the big player pays only $20-30; it all of a sudden makes sense to drive the price down with 1000 shares if they can (on low volume days). Besides, even if they sell 1-5k shares at loss but scare people into filling their 20-50k order .15c cheaper its well worth it.

Although I know for a fact Coach is right about people making bad decisions... I don't think the large batches of 100-200 shares we've been seeing are solely from dumb people. When I'm looking on Level 2's it seems almost as if a computer program is doing the transactions. The trades will happen every 1-2 minutes for a certain period then stop and continue again when it seems like nothing is happening.
The small lots that keep getting hammered out eventually drive the price in favour of the major player(s).

If for any other reason than people taking a breather from buying or selling...the small lots keep moving the price because the retail resistance comes in waves. In between the waves the price sometimes makes significant moves in favour of the person hammering the bid or ask because nobody is doing anything to defend the price.

I'm not to sure what's happening right now but one truth ultimately remains. News is the key in this whole scenario and it will in turn set the price above all. I'm hoping this upcoming NR gives us a much better picture of what type of elephant we're seeing...hopefully not the pink kind. The anticipation is killing me! lets get back over $5 and beyond already!
Should be just a little while longer.
Cheers.
Gamblor.