.[bash_]profile and .bashrc can be used on both OS X and Linux. The former is loaded when the shell is a login shell; the latter when it is not. The real difference is that Linux runs a login shell when the user logs into a graphical session, and then, when you open a terminal application, those shells are non-login shells; whereas OS X does not run a shell upon graphical login, and when you run a shell from Terminal.app, that is a login shell.

If you want your aliases to work in both login and non-login shells (and you usually do), you should put them in .bashrc and source .bashrc in your .bash_profile, with a line like this:
[ -r ~/.bashrc ] && source ~/.bashrc
This applies to any system using bash.

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