this outdoor photographer article gives you some idea of what it takes and what is involved before you plunge hard-earned dollars/euros into a new mp monster.

this is what i always point out to people that are thinking about going digital. sure, the immediacy of the images and the low/free addtional cost of making another exposure are huge advantages, but once you start adding up the costs of new cf cards, photoshop and other software, new or beefed up computer, external storage, countless hours doing post-processing, the immediate appeal of digital photography may seem less strong.