Does anyone know how to view how much tokens you've been allocated ?  I've contributed tokens in multiple periods, but can't seem to figure out a way to see the total.

I want to buy in one of the upcoming rounds in the crowdsale, can anyone advise me what to look for? Surely I would like to buy in a round when there is not so many contributions. Is there a way to check the live how much ETH has been contributed, so that I could put mine in in the last hour of the period? Other tips about buying in the crowdsale are also very welcome. Thanks in advance.

Not sure what you mean by registering EOS. You register an address not the tokens. Then you can send as much EOS to that address as you want. Right before the official EOS blockchain is released, they will take a snapshot of all the registered addresses and the amount of EOS it holds. If you have multiple addresses and don't want to use one, then register both of the addresses. As long as your EOS is in addresses that are registered, you should be fine.

easiest answer: check the articles and faq at https://www.eoscollective.org/

anyone know if testnet launch is the type of event that is streamed online, and if people that arent tbat technical will be able to be shown whats happening?

I bought EOS on Bitfinex, and sent it to MEW. Do I need to register the MEW address on EOS.IO?

Yes if you want those EOS to count once the EOS platform is complete. When you register your address, there's also a tutorial on how to verify that your address is indeed registered. I suggest making sure you've done it right.

You guys think the testnet they launch on Monday will drive the price up or down?

The bottom graph shows an average daily yield of roughly 8600ETH,
so after 160 days they already raised about 1.4M ETH or 0.6 Billion $.