Okay, these links I'm about to provide are ones from the official Dementieva site that a man there kindly uploaded. I don't think he'd mind if I posted them here, so full credit to
Phillerouge wherever he is.
Elena Dementieva v Anastassia Myskina, 4th round Wimbledon 2005
First set
Second set
Third set
Elena Dementieva v Nathalie Dechy, 2nd round Filderstadt 2005
Set 1
Set 2
Set 3
Elena Dementieva V Kim Clijsters, Quarterfinal Filderstadt 2005
From 4-3 first set to Victory
Elena Dementieva V Kvete Peschke, Quarterfinal Philadelphia 2005
From 4-3 1st set to end 2nd set
Set 3
Elena Dementieva V Patty Schnyder, Quarterfinal Open Gaz de France 2006
Complete Match
Elena Dementieva V Eleni Danillidou, Quarterfinal Proximus Diamond Games 2006
Set 1
Set 2
Elena Dementieva V Kim Clijsters, Semifinal Proximus Diamond Games 2006
Set 1
Set 2 and 3
Elena Dementieva V Anna-Lena Groenefeld, 3rd round Rome 2006
Set 1
Set 2
Set 3
Elena Dementieva V Meghan Shaughnessy, 2nd round Wimbledon 2006
Set 1
Set 2
Set 3 part1
Set 3 part 2
Elena Dementieva V Shanay Perry, 4th round Wimbledon 2006
Set 1
Set 2
Elena Dementieva V Laura Granville, 1st round US Open 2006
Set 1
Set 2
Elena Dementieva V Vera Zvonareva, 3rd round US Open 2006
Set 1
Set 2
Elena Dementieva V Aravane Rezai, 4th round US Open 2006
Set 1
Set 2
Elena Dementieva V Jelena Jankovic, Quarterfinal US Open 2006
Set 1
Set 2
Elena Dementieva V Agnieszka Radwanska Quarterfinal Luxemburg 2006
Set 1
Set 2
Elena Dementieva V Katerina Srebotnik, 2nd round Stuttgart 2006
Set 1
Set 2
Set 3
Elena Dementieva V Katerina Srebotnik, 2nd round Zurich 2006
Full match
And the rest are miscellanous ones I've found on here.
2004 Miami Final
Serena Williams def. Elena Dementieva
http://www.megaupload.com/?d=936THSWI
http://www.megaupload.com/?d=NE3UKUV4
http://www.megaupload.com/?d=XTSMPF63
Dementieva v. Kuznetsova - 2006 New Haven QF
First set.
The rest.
Dementieva v. Myskina 2004 Moscow F -
http://www.megaupload.com/?d=QCS414ZF
2004 USO QF v. Mauresmo
First set
Second set
third set
Some of the more famous ones, like the '05 USO QF and Indian Wells SF against J2HNoMore, can be found on here, or someone else can post those.