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[logopolis]

Nice! These are some cool weapon ideas!

Here are my comments:

Trip: Making an opponent fall prone is a pretty powerful effect since it grants combat advantage. In my opinion, that's a bit too strong for a basic attack (compare to the Surprise Knockdown feat, which grants a knockdown in limited circumstances). Instead, I'd suggest making this property immobilize the target until it makes a saving throw, to simulate having its legs tangled. Also, 4E no longer has opposed raw stat checks -- I'd make this a Str vs. Reflex check instead.

Bolas: With a weaker trip effect, I'd bump up the damage to 1d4 and the range to 5/10 (5/10 seems to be the minimum for thrown weapons).
Boomerang: Increase damage to 1d4. I'd say the reduced damage is a decent tradeoff for the range and effect, using the handaxe as a comparison.
Fukimi-bari: Ah, yes, the famous spitting needles. I'd definitely make it a superior weapon since it's so strange and exotic. I like the triple attack for flavour, but rolling 3d2 is pretty annoying -- I'd just make the damage a flat 2 points. Magical fukimi-bari could do a fair amount of damage since the enhancement bonus would affect each projectile, but I think the limited range and lack of stat bonus to damage would prevent abuse.
Swordcane: A bit weak for a exotic weapon. Since it's a shorter rapier, I'd give it +3 proficiency bonus, like the standard rapier.
Whip: I believe the property name is "reach", not "range".