I use Lightroom 3 for all my photo editing. It is all you really need... I do use Photoshop CS5 but 95% of my photo editing is done in Lightroom. White balance, noise, minor flaws, color tones, perfect subtle vignettes, perfect B&W, saturation and just keeping everything organized - it does it all. Direct uploading to facebook, zenfolio, animoto and organizing all your photos and their edits without touching the original file - no loss, ever. Love it.
If you take a lot of photos and want to edit them and keep them organized then you will want to check out Lightroom.
...and it is on sale. :)
$100 off the Full version of Photoshop Lightroom 3. Only $199 for a limited time, ends Nov 29th.