PS3, 360, Wii, PSP, 3DS, and PS4 all collect a little bit of dust for me. I think that the 4th-6th generations were better.

I bought PS Vita, PSX and PS2 this fall but I haven´t gotten into any of them much. Played some on the Vita, but now I only play my X360 or Sega Saturn.

Erm... if anything the DS. But i had plenty of gaming with it, and i will probably still play Tales of Hearts in it when the fan translation comes out (assuming Namco/Sony dont bring Tales of Hearts R).
I never beat the newest golden sun on it aswell.

Actually, i still got a PS2 and a GC under my TV aswell. And i still got games to play for them.
I am thinking of hooking up a TV on the bedroom and take them there instead, leaving the living room with the PS3/360 and in the future, PS4 and Wii U.
Actually, if anything the 360 is gaining dust ever since i got a PS3. I still got Resident Evil 6 to beat on it though.

PSP. It's not even that I don't have any good games for it because I have - the three MGS games released on it, as well as Final Fantasy Tactics. I just don't like playing with it for some reason. I guess it's the feel of it, although it doesn't actually feel 'bad'.

PS3 - because it was at home and I was in Uni without a TV. I brought it with me in second year and life was better.

Wii - honestly, I loved it and I went through a phase where I played it almost exclusively (even neglecting PS3). Think I went from Mario Galaxy -> Mario Galaxy 2 -> Crystal Bearers -> Battalion Wars 2, while playing MKWii and ACWii a little bit the whole time. But then I kinda lost interest to PS3 again. I don't know how/why it happened, but I never got back to Wii to finish the backlog of stuff I was interested in. Still need to get around to finishing Xenoblade & The Last Story.

I never play my wii, or my wii u, Most of my time is now spent on my xbox one, before that it was my 360. I played the first party of exclusives on ps3 and mlb the show series but other than that it was all 360. Right now my ps4 hasn't been touched since I got my xbox one. I beat KZ:SF ( hated the ending) am about 3/4's through knack, played quite a bit of fia in the beginning and loved resogun. Now it will collect dust though until probably Infamous Second Son.

Wii - haven't used it for years, it's been packed away and I just use my Wii U if I want to play Wii games
Wii U - been collecting dust since launch, sees some use here and there
360 - used to play it quite a bit but lately there hasn't been anything too interesting and I usually buy my multiplats on PS3 now a days
Vita - same situation as Wii U

PSP

The PSP i guess, even if i took some old psx classic which i play on it once in a while.

Not into handled much to begin with, but took it because i wanted to follow the Valkyria Chronicles serie, still cursing SEGA once in a while for not bringing the third game to Europe/US.

My PS3. Pretty much only used it to play Skyrim.

Based upon the fans I think they added in a anti dust system. Seriously, the fans sound like airplanes.