Lot of nervous people today..
it's understandable, a lot of people (myself included) got in the game later than they would've liked.
if i was sitting on 10-1000x what i had originally invested like some of the people on this forum, i wouldn't care at all if it was $400 or $1000
Yeah, I understand that but you shoudln't be too nervous. YOu won't lose your money, if it crashes it will come back in few weeks or months. Always did, always will.
And you can trade altcoins in the meantime and get more coins then you had while waiting another rally.
So, unless you don't have a mortgage on your house to buy Bitcoin, and you shouldn't, you should be relaxed. Bitcoin is not going anywhere

Where do you trade altcoins, btc-e? And do you have any tips?
BTC-e mostly, yes, though I was dealing with DGC recently on Cryptsy and Bter.
No, I do not have tips, watch the market for coins with most of the volume preferably (btc-e ones has good volume, all of them), wait for drops, sell on pumps etc..