You might want to start with
and click on the where to buy link.
While it is the most integrated, it does have at least one annoying limitation. The current Alpine head units can only display the first 255 items in a list - so if you have 300 songs or 300 albums in a list, you will only see the first 255. You can still play all of the music. This is a limitation of the HU's not the adapter - which were probably designed to deal with as many songs as some one could squeeze on an MP3 cd not a 20 GB+ iPod.
If you have a D2B bus and want to keep your HU - not what I want to do - there is another alternative that charris discovered that adds an Aux in
. The Logjam site says it isn't currently available, and it isn't listed on the Soundgate website. On the Soundgate website, they just ask you to e-mail them for info relating to MB HU's. charris, in a post on the R170 forum, said he contacted Soundgate and was told the part is in production.
An alternative to the Alpine solution is to have any HU with an Aux in and use a dock or a Sik Imp
or the din, to get line out of the iPod.
I do plan on going with the Alpine solution. In the meantime, I probably have to eat some words here, I'm using a cassette adpater. These are not all created equal, the Sony CPA-9C is pretty darn good. Plus, you can run line out into a cassette adapter. So pick up one of the Sik products or the Belkin Auto kit, which has an amp with volume control on the line out, and you can get pretty decent performance. Better than you can get with an FM solution, especially the wireless solutions, but you have to deal with wires. My temporary solution is the Sony cassette adapter plus the Belkin Auto kit although I don't always use the Belkin.