Hello BMW owners!

I have a BMW 323i, 1999.  No CD player there, but of course, an option
for CD changer which located in the trunk area.

Is there any products that I can easily hook up an MP3 player to my
car, and I can select songs easily, etc?

...Many years ago, I tried portable mp3 player + cassette tape player
adapter, which was inconvenient.  Then a PDA with an adapter to use FM
radio, the sound quality was awful.  PDA + tape player adapter works
fine, but still cord clutter and it's not convenient to carry PDA to
the car, hide it when I leave the card.

I recently purchased cassette tape lookalike MP3 player from Think
Geek, takes 2GB SD card, just use it as a cassette.  Sounds simple and
nice, but I can't select songs easily, and it only plays number of
songs over and over again, although I have hundreds of songs on the SD
card.