I'm not sure if this is advise or rules as I haven't seen anything coving this in the rulebook. Found some advise how to deal with invisibility in other threads but nothing from a mechanical poverty.
When a creature/PC is invible (and no one cansee them) do you (should you) remove their mini off the battlemat until their position is identified? And if you remove them, how do you deal with collisions?
I remove NPC and creature miniatures if no PC can see them and simply remember their positions in my head. If there are multiple removed, to the point of getting confusing (thankfully an incredibly rare occurance), then I put a poker chip under the miniatures to note that they cannot be seen and my players will respect that. PC miniatures I keep on the battlemap, since both the players and I, as the GM, need to know their character's positions even if the NPCs and creatures can't see them.
When there would be collisions with invisible creatures we often play it by ear. If the invisible being wants to allow the moving being to pass, it is done so without problem (like passing through a friendly creature's square), if they don't want them to pass, then we play by the rule of being unable to move through an enemy's space and they bump into each other and the moving being is pushed back to its last legal space before being allow to continue their movement if any remains.
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My table sounds very similar to Ringtails, with one difference. If you enter the square of the invisible character (pc or npc) the invisible creature may make an AOO as you attempt to enter their square. This is a very tactical question as that will break invisibility as well.
A common practice is to spread out (we kind of imagine it like people with their arms held out trying to feel for the invisible foe) and see if you can bump into the invisible foe. Of course if the invisible foe wishes they may just allow you to pass through.
If you use a battlegrid, take a pen/marker/whatever, and give the map coordinates. Number the rows, and give each column a letter. Then you just keep a small piece of paper handy, and write down where the invisible creature is.
With no mini on the map, the PCs are forced to guess which square the enemy is in (like they are supposed to).
My table sounds very similar to Ringtails, with one difference. If you enter the square of the invisible character (pc or npc) the invisible creature may make an AOO as you attempt to enter their square. This is a very tactical question as that will break invisibility as well.
Actually, as most invisible creatures will threaten adjacent squares, of course it can make an AoO when some enters their square. ;)
Anyway, I also handle it the way most of you do, take the mini of the map and take notes of where it is (though not with map coordinates, but rather in relation to the nearest terrain feature or so). I also rule that the invisible character can choose to let s.o. pass, as long as the character entering the square doesn't want to end it's move there. In that case, I'd allow that creature a 5ft step (and subtract that movement from his next turn's movement allowance (movement allowance, not action allowance)).
While I agree with most of what has been said in this thread I would probably allow some chance of finding an invisible character with the tactics described, and an even greater chance with greater coordination.
For the run around waving your hands about tactic, I'd require a DC 10 acrobatics check to avoid detection if someone passes through your square and you haven't readied an action to get out of the way. You could totally take a 10 on this unless you were in some way unusually distracted or threatened, however.
If a group wanted to form a line, link arms, and march shoulder to shoulder, I'd probably require the invisible party to make the acrobatics check for passing through a (flat footed) enemy's space. People in this sort of formation take up a lot less space than 5 ft square however, and I'd probably say 2 medium creatures or 3 small would fit in a space for this purpose. This would also probably count as squeezing, making it even a little easier for the opponent to slip by, but still much more difficult than another method.
If they combine the previous strategy with something like a trawling net, the invisible character just got himself detected, and probably trapped in the net to boot.
When in doubt, consult classic cinema ;)