*Cough* Anyway, here're a couple amusing things I ran into, feel free to add your own!
1) The Belt Scraper
Ever wanted to split the two halves of a belt, but a filtering Smart Arm isn't fast enough? Try a belt scraper!
Half-Belt-Hero
The open side of the belt can put goods into the entryway, but the covered side can't. This is great for combined input-output belts, since you can block the excess input, as shown!2) Item Interleaver
Ever wanted to guarantee a 1:1 item ratio on a single side of a belt? Grab a dozen wires, some chests, and a rock, and now you can!
Jam-proof Interleaver
I'm sure there's a better way to do this only involving chests, but my brain breaks whenever I try to work through all the potential jam situations. This skips the headache, and is sufficiently fast to supply 6 non-speedy Sci3 assemblers. This design is immune to shortages of either input, and oversupplies on the output lane. If you have a better design that accomplishes the same, please share it 