Well, I'm old school, so two oldies off the top of my head.
I LOVE the sitar (sp) part in George Harrison's "My Sweet Lord." It was such a new sound at the time, but that's my favorite part of that song. I wish he would have used it more.
Also, I love the guitar solo at the end of "Hotel California." I saw the Eagles live about 10 years ago, and they played the newer version with a regular guitar. I love the song, but it wasn't the same as the original without the electric guitar.
TIS