P2SH Transactions help

[greBit]

Im struggling to find documentation on the BIP 16 stuff - the 'Pay to Script hash' transactions...

1. Are these now counted as 'standard'? or will I be waiting a long time for confirmations?

2. Is the address format different? ive seen somewhere that P2SH addresses would have a '2' prefix instead of '1'. is this true?

3. How much support is there for this ... could I get Bitstamp/MtGox to withdraw my BTC to a P2SH address?

thanks for any help

[greBit]

Well MtGox for one does not support P2SH addresses

[kjj]

To answer your other questions, they are standard, and the addresses do use a different prefix byte.

[pc]

Sending to a P2SH address is standard. Spending from that P2SH address is only standard if the script that hashes to that address is standard.

The address prefix is selected to start with a 3 on the real network, and a 2 on the test network.

I don't know about Bitstamp or Mt. Gox specifically, but any service built on a current bitcoind should support it just fine. I suspect that most services support it and may not even realize it.