I believe there are many threads on this forum answering that question...
Anyway, I'll give it a go...
Dire Straits era- Eastbound Train, b-side to Sultans Of Swing
- In My Car (played live)
- Bernadette (played live)
- Me And My Friends (played live)
- Real Girl, demo version has leaked
- That demo sung by David Knopfler, of which I forgot the name
- Making Movies, demo to Skateaway, has leaked
- The songs from the ExtendeDancEPlay: Twisting by the Pool, Two Young Lovers, If I Had You, Badges Poster Stickers & T-shirts (US edition only, b-side to Private Investigations)
- Millionaire Blues and Kingdom Come, b-sides to Heavy Fuel and Calling Elvis, also available als seperate singles in iTunes
- I Think I Love You To Much (played live)
- Demo versions/alternate mixes from the Dire Straits, Making Movies and On Every Street (+ Timothy White) sessions remain unreleased, but some leaked
- The Honky Tonk Demo's, four demo's from the DS album sessions, to be released within a few weeks (record store day '15)
Golden HeartB-sides: Gravy Train, My Claim To Fame, Tall Order Baby, What Have I Got To Do
Unreleased songs: No Wonder He's Confused, The Water Is Wide (O Waly, Waly), demo version of Secondary Waltz and also some instrumentals have surfaced
Sailing To PhiladelphiaLet's See You, The Long Highway, Camerado
Unreleased: Pyroman, played live
The Ragpciker's DreamSmall Potatoes
Shangri-LaSummer Of Love
Get LuckyPulling Down The Ride
Home Boy
Good As Gold
Early Bird
Time In The Sun
PrivateeringYour Perfect Song, Follow The Ribbon, River Of Grog, Occupation Blues
TrackerMy Heart Has Never Changed
Oklahoma Ponies
Time Will End All Sorrow
Hot Dog
Terminal Of Tribute To
Heart Of Oak
.38 Special
That must be everything!
There's a lot written about it, this list is nice too:
http://forums.stevehoffman.tv/threads/what-are-mark-knopflers-rare-songs.294048/page-2