Question: I'm using the Adobe CS5 suite and trying to upload all of my pictures to Facebook... and .NEF files are too large to upload, any suggestions?

Answer: 
There is a very easy way to convert a group of photos to jpeg format within Photoshop. It is done within the Image Processor which is located as follows File > Scripts > Image Processor then a pop-up screen appears. (Depending on your version of Adobe Software, this can also be done in Bridge.)

Within the Image Processor - 
Step 1. Locate the folder where the images are stored.  

Step 2. Select either 'save in same location' or you can select a different location. 
Step 3. Select the output format - Jpeg, PSD, TIFF. If converting the images for facebook, select jpeg, quality under the number 5, check 'resize to fit' and at 800 or lower number to the W & H boxes. (Photos loaded to the internet don't need to have a high pixel resoluation. The quality and resize would need to be different if the photos are going to be printed.)
Step 4. Nothing needs to be checked for images that will be loaded to Facebook.
Step 5. Click 'Run'.

While Photoshop is processing the images, you will not be able to use Photoshop. The Image Processor is an auto process that will create a new image for any image within the folder. (If sub-folders is checked within Step 1, it will also create new images them.)

Note: The Image Processor will create a jpeg file for any picture within the folder. Depending on the number of photos in the folder, size of the images and output size, it can take only a few minutes to over an 45 minutes. [I shoot in raw (nef) format and have a SD card with a lot of memory so output (jpeg/psd) really affects the processing time. As one of the contributors indicated above, I also create jpegs to review/select photos because jpeg files are smaller and faster to load and thus review.]
Create a [batch process](http://www.youtube.com/watch?v=PTtWEtN06EI) to convert from .NEF to .JPEG with Photoshop. Don't forget to include closing the picture in your recording as Photoshop does have a finite limit on number of open files. This solution is ideal if you took your photos in the same lighting condition so corrections, if any, are the same. 

For corrections: at the very least, you need to reduce your file size (i.e. change dpi, dimensions) to meet Facebook's restrictions.