Well, the both the earphones and in-ear headphones with remote and mic are listed on the official accessories page, so it's pretty safe to assume that they are supported.
Compatibility Information
* The remote and mic are supported only by iPod nano (4th and 5th generation), iPod classic (120GB/160GB), iPod touch (2nd generation), iPhone 3GS and iPad. The remote is supported by iPod shuffle (3rd generation). Audio is supported by all iPod models.