I figured id enlighten you all. I take no credit, pulled this from TL and then Psy (a great zerg commentator channel on youtube) posted a tutorial. It boosts your mineral income between 5-10%.

http://www.youtube.com/watch?v=23Y7ZPfUOz4

you shift right click-c while highlighting a drone with minerals on its way back to the hatch.

Saw this alrdy. Good trick though.

oh yeah i've been doing this for a while and then someone posted it on team liquid and gave away the secret. It only helps if you can do it intensely but since i'm not very good at it i can only get a few workers going at a time. it at least spikes your apm up high early game haha

Another time to do it is when you're gearing up for a transfer. group however many workers and right click a mineral patch from base 1 then queue them up to move away from the minerals. don't transfer them yet. once they all have minerals and are idle for a second you can right click the main building at base 2 and do the shift click. it lets you get a lot more in and the command works for all the drones in the group
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I tried this.. it gives you something to do early which is good, but I don't think it will ever have any impact on any of my games.

once you have 2 workers per patch, it isn't worth doing anymore. Realistically, it gives you about 30-40 more minerals in the early game. Hardly worth the effort, especially when working on fundamentals will improve your play faster.
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"I tend to thougoughly enjoy my encounters significantly more with 120+ types, as I find them more stimulating. 100-110 people are okay too operating at full capacity." - Paper_Boy

yup, i dont think its really worth the effort early either, unless you want to or have naturally insane fingers. sometimes it makes me drone a second late which is obviously not worth the small boost in minerals

StarCraft II: Wings of Liberty - Patch 1.1.1

Bug Fixes

Fixed an issue where queuing Return Cargo on a worker would cause it to ignore the built-in delay after it finished gathering
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"If we are the only mammals that cannot take care of ourselves out of the womb, how are we here?" - GoldHP