How can I process Bitcoin transactions in my store? What merchant solutions are available to integrate Bitcoin in an online store? Is there a wiki page that describes the different merchant solutions?

Note - This question was originally asked specifically for a PHP store, but since most solutions are platform-agnostic this part was edited away.
StrongCoin has developed a PHP script for fast handling of micro transactions. You can read more on it here:


https://strongcoin.com/blog/bitcoin_micropayments_with_strongcoin
http://www.thebitcointrader.com/2011/12/monetizing-blog-with-bitcoin.html?m=1