AIFF MP3 Converter
Full user review
"Makes changes to browsers changes default settings"
Seems to work for AIFF to MP3 conversions - but see CONs below.
The day after I installed this, I discovered that the default search engine in all 3 of my browsers had been changed from Google to something I had never heard of. In addition, a mystery toolbar had been added to my browser.
CNET, you should have a policy that disallows such sneaky software on your site.