Just in case I forget - Batch convert PDF to JPEG using Adobe Acrobat Pro

Choose Advanced > Document Processing > Batch Processing to open the dialog.

1. Click New Sequence.
2. Name the sequence in the field that displays.
3. In the Edit Batch Sequence dialog that displays (lots of dialog boxes here!) click Select Commands to open another dialog named Edit Sequence. There are a list of commands at the left. Scroll through and find one that is fairly innocuous, such as Flatten Layers and click Add to move it into the active command list. Click OK to return to the aforementioned Edit Batch Sequence dialog.
4.Click Output Options.
5. In the Output Options dialog, click the Export File(s) to Alternate Format button, click the dropdown arrow and choose JPEG.
6. Click OK twice to return to the original Batch Sequences dialog.
7. Click Run Sequence to try it.

Courtesy of dbaker at http://www.acrobatusers.com/forums/aucbb/viewtopic.php?id=2934