A few assorted bits & pieces you may find useful, all freestuff:

Scenes:
Poolkit- http://www.zokeimaster.com/
Washitsu- http://mugi.site.ne.jp/lab108

Clothing:
School swimwear for MayaDoll- www.3digitalcrafts.net/studiomaya/
Malefic-SuitV3.zip
TabXmas06-AmaraA3(C)Tabala 2006
Extreme swimsuits for A3 from- http://www.zokeimaster.com/
RacingSwim for A3 from- http://www.zokeimaster.com/
MD schoolgirl.zip- by Taruru.
A3schoolUF.zip- by tentman.
A3schooluniform.zip- (textures) by sarponita.
Harness for V3,A3,MD- can't remember who made it!
A3SchoolShoes.zip- by tentman.
l33t school girl-a3.zip- by EvilInnocence, plus many texture downloads.
(also for V3)
KatarinaPOB_V3_31785.zip- by powerage.

Props:
Washitsu lamp- http://mugi.site.ne.jp/lab108
Tatami- http://mugi.site.ne.jp/lab108
dog_collar- http://mugi.site.ne.jp/lab108
Ptrope_V3_Ball_Gag- http://www.ptrope.com
Gymladder- http://www.joes3dfantasyworlds.com/down/downpreview.htm
rdna_epflail.zip- http://www.runtimedna.com
rdna_chainednip.zip- http://www.runtimedna.com
Legs spacer V3.zip- can't remember who made it!
ADP_BodyExposer.zip
bondage rack.zip- by bugrer1.
Cage.zip- www.most-digital-creations.com
Quist3D_Frame01.zip- http://www.sharecg.com/v/13406/poser/Quist3D-Frame-1
Quist3D_Frame04.zip-

Various props from: http://trekkiegrrrl.dk
                    http://www.renderotica.com
                    www.sharecg.com

There's lots more free stuff on my hard drive, but some people don't leave a readme file
or include a name or contact details so I can't figure out where I got them from. But a
good search on Renderosity & sharecg.com should turn up lots more, and it's well worth
doing a Google search for Poser stuff and set the advanced search to include only
Japanese websites. There's lots of good quality Japanese free stuff out there.