EG:

The drums in Slave 2 The System that follow the chorus were later used in SLAVE

or

Guitar in Slave 2 The System was leter used in High

any more?

There are countless instances of these. To name a couple...

Guitar from "Rave Un2 The Joy Fantastic" (unreleased at the time) was worked into "The Max" as an airy synth throughout the song

Horn section during the live version of "I Could Never Take the Place of Your Man" (from SOTT Live video) resurfaced as the horns in "Rock Hard in a Funky Place" on the Black Album

"Work That Fat" reuses "Martika's Kitchen."

the drums in slave were taken from ain't no place like u on mayte's album

the rythym track from feelgood was used on chaka's album on the song reconsider

the horn lines on i like funky music were from the original version of feel u up

the guitar rift at the end of when u love somebody was used on the same track from mayte's album

new power soul from nps takes the get freaky let ur head bob from big fun off of exodus
[Edited 1/10/08 11:14am]

I find it really cool when he reuses his own stuff and references himself, as long as he´s not doing it all the time. I mean come on, it is his body of work, and it´s just something that only the most die-hard fans would notice. Makes it even more interesting to hear some familiar sounds, just like you´d find reoccuring details in the works and whole body of work of other great artists, like Picasso´s or especially Salvador Dalí´s paintings. Something like a trademark, a pleasant familiarity. I like it, better than stealing stuff from others, like some other producers do.

More:

Push It Up obviously uses stuff from Jam O The Year

BatDance has a sampled vocal section from Rave

My Name Is Prince samples I Wanna Be Your Lover
The Continental contains a huge chunk of Tell Me How U Want 2 Be Done
Orgasm uses the guitar from the end of Private Joy

RumAndRaisin said:

A lot of the Batman pieces sample each other.

Get Yo Groove on contains a tiny piece from Madhouse's 6

The Max also samples Rave.

Genesia said:

tell me how u want 2 b done IS the continental albeit remixed by kirky j

Carmen Electra's "All That" has the same background music as Adore.

The Time's "My Summertime Thang" has the same background music as "The Latest Fashion".

"Gett Off" uses a tiny bit of "Get Off".


[Edited 1/10/08 13:52pm]

L4OATheOriginal said:

Then that would explain it!

Doozer said:

Rockhard in a Funky Place was probably already a ready to go song, and that part of the SOTT movie is a brief cover of that song thrown in, just like SuperFunkycalifragi is thrown into Its Gonna Be a Beautiful Night.

More:

Space (Funky stuff Remix) samples The Boom by poet 99 (all the way through "the boom the boom the boom the boom...)

and,

Face Down uses a loop ("dead like elvis") from a poet 99 song

and,

Days Of Wild uses the (Hold On To Ur Wigs) phrase from poet 99's "Its Our Music"

and,

Joint 2 Joint uses the "Sex Me" phrase from "Burn" by poet 99

"2 Whom It May Concern" samples... er... nevermind.

Mr Happy uses a tiny bit of Eye Hate U

in the "i cant love u cos eye hate u" part