Ms. Baba Jaga 
The project RW (rhyming words) consists of collecting rhyming words. It was actually pointed out to me by Jed Hartman that some of these words are not technically rhyming, some of them have just similar structure, but if you take a look at the collection below, you'll get the picture. Sometimes, these words are called "second order reduplications", as opposed to "first order reduplications" that I simply call "identical words". So far most of the words come from only a few languages, so if you know any other, let Ms. Baba Jaga know and she'll include them.
CIMPR-CAMPR (to pieces) 
C^ACHRY-MACHRY (unfair or unclear deals)
C^A'RY-MA'RY (a generic incantation) 
C^ORO-MORO (mess; turmoil)
ENYKY-BENYKY (a nursery rhyme used to select one kid out of many) 
HALA-BALA (recklessly)
HATLA-MATLA (blurry painting, a mess, inarticulate speech) 
HOGO-FOGO (posh)
HOKUS-POKUS (same as hocus-pocus in English)
JAKZ^-TAKZ^ (so-so)
JAKYS-TAKYS (of dubious origin; vague) 
KLI'D^O-PI'D^O (easily; without fear)
KRINDY-PINDY (interjection, sort of like "oh, my")
KR^I'Z^EM-KRA'Z^EM (criss-cross, without destination) 
LA'RY-FA'RY (nonsense)
LA'Z^O-PLA'Z^O (in a leisurely manner)
MY'RNIX-TY'RNIX (without any reason and/or effort)
SAKUM-PIKUM (altogether)
SAKY-PAKY (belongings)
TECHTLE-MECHTLE (a clandestine intimate relationship)
TR^ESKY-PLESKY (nonsense)
VOLKY-NEVOLKY (not really wanting to)
there were so many English words that I had to create an English pavilion and move them all there.
BONANT-MALANT (ok, as in - it's going ok) 
CAHIN-CAHA (barely making it; with difficulty) 
COUCI-COUCA (little by little) 
PELE-MELE (in complete disorder)
DANN UND WANN (now and then) 
HOLTERDIEPOLTER (helter skelter)
HOPPELPOPPEL (eggnog/breakfast made from scrambled egg with ham and fried potatoes)
IN HULLE UND FULLE (abundant/aplenty)
IN SAUS UND BRAUS ((to live) in clover/the Life of Riley) 
KLATSCH UND TRATSCH (gossip)
KLEIN, ABER FEIN (small but mighty)
KUNTERBUNTER (motley/higgledy-piggledy)
LUG UND TRUG (a pack of lies)
MEHR SCHLECHT ALS RECHT (after a fashion)
MIR NICHTS, DIR NICHTS (at the drop of a hat/just like that)
MIT ACH UND KRACH (by the skin of one's teeth)
RUCK ZUCK (quickly)
SCHLECHT UND RECHT (rough and ready)
TRIPPER_CLIPPER (German slang) a holiday flight to Thailand, taken for the purpose of
"sex tourism"
UNTER DACH UND FACH (in the bag/sewn up)
WACKELDACKEL (nodding dog)
TOHU_BOHU (describing the primordial condition of the earth) 
AKOM-BAKOM (the scribble) 
CICA-MICA (a cat; used by kids) 
CSERE-BERE (exchanges) 
EGYEDEM-BEGYEDEM (a nursery rhyme used to select one kid out of many) 
EJNYE-BEJNYE (a bad thing to do; usually parents say this to kids) 
ETYELE-PETYELE (to treat someone as being very close) 
HANDA-BANDA (a lie, not a true story) 
HOKA-BOKA (playing and joking) 
ICI-PICI (small, little) 
ICIRI-PICIRI (similar to ici-pici, but stronger) 
INGO-BINGO (adj., meaning waving motion of flowers in the wind) 
IRKA-FIRKA (illegible handwriting) 
KUTYULI-MUTYULI (a dog; usually used by kids) 
LACA-FACA (to be undecisive, to think a lot what to do) 
LOCSI-POCSI (to splash) 
RIZI-BIZI (a meal made out of rice and peas) 
SULI-BULI (a school party) 
SZEDETT-VEDETT (randomly chosen) 
SZEDTE-VETTE (adj., unorderly, usually about children) 
TARKA-BARKA (motley) 
TERE-FERE (to chat) 
UGRA-BUGRA (to hop around) 
UGRI-BUGRI (same as ugra-bugra, only faster) 
CEDUSA-MEDUSA (a latin name for a certain bug) 
NOLENS-VOLENS (out of necessity) 
CZARY-MARY (something mysterious, magic) 
JAKO-TAKO (so so, "in the norm" - as in the reply to "how are you") 
SZACHER-MACHER (dubious business) 
After I included Latin names of certain animals, identical words grew so large that I had to place them into a separate file.
Pierre ABBAT 
Ildiko BAJKO 
Christopher CONSEIL 
Veronica CONTRERAS 
Jim CROTTI 
Mark DAVID 
Robert DAGIT 
Jessica EVANS 
Chris GOLE 
Dorota GUT 
Jed HARTMAN 
Jan KUCERA 
Arthur LAWRIE 
Jim MOSKOWITZ 
Karel OLIVA 
Laura PENNYCUICK 
Lubos PICK 
Diane PORTER 
Mirko ROKYTA 
Jan REHACEK 
Jenny SMITH 
Sloane STALDER 
Neil TAYLOR