This is a bit random but I loved Doraemon a lot while growing up and this just brings back so many memories. This OVA, The Night Before a Wedding, is the one where Nobita was worried that Shizuka is getting too close to Dekisugi (now I know his name is a pun for 'capable of doing too much' XD makes sense) so Nobita and Doraemon used the time machine to have a look at the day of his wedding. This was one of the more touching episodes of the series :)
I'm sure this is a modern OVA because the drawing and quality looks better than the classic 80's anime I remember. They also added a few things that weren't in the manga.
Links (extract with winrar):
Part 1: http://www.megaupload.com/?d=A8DGXF
Part 2: http://www.megaupload.com/?d=F9K7D9
Part 3: http://www.megaupload.com/?d=759B4M