Google App Engine supports Python and Java now, but does not support PHP, but some body offer a hack to Run PHP on the Google App Engine.
He uses Quercus in GAE.
Quercus is Caucho Technology’s fast, open-source, 100% Java implementation of the PHP language (requires JDK 1.5).
For details, please visit,Run PHP on the Google App Engine

Reference,
Run PHP on the Google App Engine
Quercus
A Demo

Today I was told one of our server has been attacked through SSH, so I asked my friend, if there are any tools I can use? he recommended DenyHosts.

DenyHosts is an open source script intended to be run by Linux system administrators to help thwart SSH server attacks (also known as dictionary based attacks and brute force attacks).
If you’ve ever looked at your ssh log (/var/log/secure on Redhat, /var/log/auth.log on Mandrake, etc…) you may be alarmed to see how many hackers attempted to gain access to your server. Hopefully, none of them were successful (but then again, how would you know?). Wouldn’t it be better to automatically prevent that attacker from continuing to gain entry into your system?
You can Download the latest version of DenyHosts here.

Today Return Path releases a new Email Deliverability Benchmark Report. It’s been a few years since we published this kind of data and the big news is that the news hasn’t changed much in that time. On average, commercial email is still being blocked at a rate of about 20%.
Want to download the report but do not want to register on Return Pah, please down load it here.
for details, please visit 2009 Deliverability Benchmark Report: Don’t Be a Statistic