Wayne Routledge completed the Magpies scoring with a low strike before Brett Ormerod smashed home a consolation.
Sandor Torghelle and Wayne Routledge both went close for Palace but they remain two points adrift of safety.
Miller is QPR's third signing of the January transfer window, following the arrivals of Wayne Routledge and Pascal Chimbonda.
Palace drew level for the first time just after the restart when full-back Danny Granville nodded home teenager Wayne Routledge's cross.
Fulham boss Chris Coleman made an inevitable change after 56 minutes, sending on Wayne Routledge for the disappointing Papa Bouba Diop.
Goals from Andy Carroll and Wayne Routledge sealed a comfortable win, which also saw Plymouth relegated to the third tier of English football.
The visitors were similarly industrious at the beginning at the start of the second half but only had a wayward effort from Wayne Routledge to show for it.
He doubled his Fulham tally and squared the match after 15 minutes of his arrival when he met Wayne Routledge's corner with a spring-heeled header at the far post.
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Carroll fluffed the opportunity but almost made amends moments later, stretching to get a foot on a teasing Wayne Routledge cross to force Forest skipper Camp into a diving save.
Spanish star Michu grabbed the second with five minutes remaining of the first half before Dyer scored his second goal just after the break after being set up by Wayne Routledge.
Fulham, who were without striker Bobby Zamora, had failed to clear Gower's corner before Wayne Routledge's miscued ball fell to Sinclair and his seemingly innocuous effort was turned in by Fulham's top scorer.
However Hughton was given money to spend on players during the January transfer window, bringing in defenders Mike Williamson and Danny Simpson, winger Wayne Routledge and striker Leon Best - all for undisclosed fees.
Only the omnipresent Gardner had a real sight on goal for Villa in the second half when he arrived late to latch on to a Wayne Routledge cross and unleash a shot that was deflected wide.
And the visiting side appeared to settle quickly as Wayne Routledge, who had a tough tussle with Stevenage left-back Scott Laird, delivered an early cross that Barton drilled goalwards, forcing a decent save from Chris Day.
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