While Monero is rising in popularity, it may be a good idea to contribute with some hashing power to the network !
Let's assume you have a computer with decent CPU, running DEBIAN Jessie.
Here is a mini-guide based on a fresh installation of Linux.
Install dependencies
sudo aptitude install git cmake libboost-all-dev libssl-dev libevent-dev libdb++-devGet the sources
git clone https://github.com/monero-project/bitmonero.gitCompile
cd ../bitmonero && makeRun
./build/release/bin/bitmonerod
The result is quite simple, after all !
NB : you can download the blockchain before step 4 if you want, nothing special about that.
Link here : https://getmonero.org/downloads/