I just ripped a CD into MP3 tracks and imported the tracks into my Sansa Fuze MP3 Player using Sound Juicer.  The MP3's played just fine but the Fuze did NOT recognize or read the MP3 ID3 Tags.  

After doing some digging, I discovered that Sound Juicer (via gstreamer) created MP3 ID3 Version 2.4 tags.  Most MP3 Players on the market do NOT read version 2.4 tags.  (Sanze Fuze, Sony Walkman MP3 players etc).  But most can read version 2.3 ID3 tags.

I discovered that you can compile and install another gstreamer plugin (called id3v23mux) that will create mp3 ID3 version 2.3 tags.  In Sound Juicer or Rhythmbox, you cam modify the gstreamer pipeline for the MP3 encoding and replace the default tag generator, id3v2mux, with a tag generator that creates version 2.3 tags, id3v23mux.  I tried it and it works great.

See http://bugzilla.gnome.org/show_bug.cgi?id=459226
Emmanuel Rodriguez did a great job developing the necessary code.  A link to the source code is in this post.

It would be great if this id3v23mux plugin was also included in gstreamer.  It would give people the option of encoding mp3 ID3 tags into the version 2.3 format.  As mentioned, many, if not most, MP3 players today can only read version 2.3 tags (NOT version 2.4 tags).

Rob
P.S.  Tested Sound Juicer (and Rhythmbox) on Ubuntu Hardy Heron with a Sanza Fuze MP3 Player.