Every once in a while I'll see someone who's stacked their chips in "hundreds" (every 4 greens turned 90* to each other [for instance]), but most players just have them all aligned together in their rack. Most have them arranged by color, some don't even care and seem to just rack winnings as they're paid.
I didn't used to care; I'd sort my rack after every hand--by color and counting up periodically. Now, playing and betting with more, I think it's important for me to find a way to rack them so's I can see where I stand at a glance. Sooo... now, I'll have my white chips on the far left (handy for "50 for 1's", etc); next to the whites I"ll separate $500 of greens with single white chips; any odd extra green is turned 4x at 90* (in hundreds) on the $500(s) right, and the red chips are to the farthest right side.
Unfortunately, I haven't needed a second row to tally my money

Yet, it's important to me to know where I am in the middle of a hand (lots of times); I'd like to know when my Place bets are paid for themselves, (so's to know if I wanna parlay, etc). Once I blew it because I didn't realize I had >$600 on the table and another 8 in that hands' winnings--I would have regressed to minimums (except for a Signature Number) if I'd known I was holding 800 in the second rack but I was a real neophyte and didn't even have the green separated--and of course, I 7'd with almost as much on the table as I'd won.
Nowadays, I (try to) play with very few others and the HR dealers know me so they slow down enough (especially when I'm the shooter and obviously counting chips) to let me "take inventory" but when I'm not the shooter, the dice move really fast and I can't keep up.
How do ya'll "keep inventory" (and do you do it during a hand, too, or only after each hand sevens out)?
Thanks!