This week's book giveaway is in the Performance forum. We're giving away four copies of The Java Performance Companion and have Charlie Hunt, Monica Beckwith, Poonam Parhar, & Bengt Rutisson on-line! See this thread for details.
It depends on your Linux distribution. For Ubuntu, you just need to start Synaptic, look for Apache and install it. For other distributions there are similar techniques. For others you will have to install it manually.