I have some BTC and just bought some PTS on Cryptsy and transfered them into my BitShares-PTS wallet for Mac. I assume there will be another snapshot at somepoint in the next few months, right?
Correct, none announced yet but several DACs in pipeline
Do I also want AngelShares? Or should I just buy more PTS with my BTC rather than donate to the 1Angel... Bitcoin address?
PTS is liquid and so it costs more per share, but also read this: https://bitsharestalk.org/index.php?topic=3703.0
If I donate to the 1Angel... Bitcoin address how do you guys know where to send me my AGS? You can't send non bitcoin cryptocurrencies to a bitcoin address, can you?
They will be "sent" to the "from" address you donated to AGS from. So keep the wallets from which you donated. Those keys can be used to claim your share on the new blockchain. So:
Or is that bitcoin address now in your records for future bitcoin dividend payouts from yet to be deployed DACs?
sort of, "your records" is the bitcoin blockchain
Can I sell the AGS one day if I want to?
See above thread. Short answer is "no".
Can I buy someone's stake in BitSharesX?
XT is the snapshot chain for all BTS X chains so you can trade when it launches sometime soonish. ATM you can only trade IOUs.