My rituals include reinstalling the OS and while doing it, paring it down (deselecting languages and apps I don't want etc.).
Secondly, I run software update.
Third, I install my audio apps etc. download them if necessary - and update those (Soundbooth, Waveburner, Wave Agent, Wave Editor, Soundsoap, Bias Peak, Bias Deck, MS Office).
Then, I set up Mail.app, to work with my different accounts.
And while mail downloads the mails from my accounts, I download VLC player, Mplayer, Cog, Omniweb (pay-for browser), Opera, Firefox, Bean (awesome, simple text editor based on text edit), UnrarX.
When that's done, I copy many of my settings over. Many, not all. This last step is irrelevant to you, of course.