The Nook supports a wide range of e-book formats, including ePub, BBeB, Adobe PDF, XLS, DOC, PPT, PPS, TXT, DOCM, XLSM, PPTM, PPSX, PPSM, DOCX, XLSX, PPTX, JPG, GIF, PNG, BMP, MP3, AAC and MP4 formats.
However, if you're accustomed to an iPod and purchase songs on iTunes, the format that is used by Apple is actually AAC or Advanced Audio Coding.
Sound Files - There are many different file types - WAV, MP4, AIF, AAC - but by far the most common for podcasts is the MP3 files.
Podcasts are usually in a file format such as MP3, AIFF, or AAC - it really doesn't matter that much, as most computers can play a variety of file types.
It accepts AAC audio, as well as MP4, M4A, and 3GP files.
In order to burn iTunes using Nero, you would have to first convert the AAC files to another format, usually MP3.