This is a very insightful article on MediaTemple's efforts to build one of the first massive web hosting grid: Anatomy of MySQL on the GRID
Finally, I set up a local SMTP server on my laptop, which mostly works. But about 10% of my mail gets bounced as large blocks of ISP addresses are generally blacklisted.
Today I discovered that with my gmail account, I have available to me secure SMTP service for all my email accounts!
I'm not sure when this came out, but Google now has source code search. These guys never stop amazing me.
So what you need to do now is create a new bookmark in firefox. Point it to: http://www.google.com/codesearch?hl=en&q=+lang:php+%s
Give it a name and in the keyword field, put something like 'phpcode'. Save it.
Now in your address bar, type 'phpcode array_merge' and return.