I don't see Orgcoin on manicminer.in but I remember them announcing over in our forums and I see some folks here saying they're getting some.

It looks like ManicMiner is using p2pool, if that's the case you need the following settings or you're going to see a lot of wasted/rejected hashes.

expiry=10, scantime=9 queuesize=0

If you still see > 10% rejects then turn your intensity down a bit.
Orgcoin has a 10 second block time, having your expiry higher than that means you're totally wasting hash power.
Also I'm not sure about mining USC & Org together they use the same pch message header and that could be confusing things.
In the next major release of Orgcoin that will be fixed, but we never expected to be merge mined with other merge mineable coins.

If you want a quick run down on how merge mining works look at namecoin or devcoin both of which are regularly merge mined with bitcoin.
To put it in it's simplest terms the mergemined coin is setup to accept the parent coins PoW as its own.  This is especially acceptable in instances where the child coin is quiet (not a lot of transactions going on). And it helps to make the coin far more resilient against 51% attacks since the child coin effectively gets the hashing power of the parent to protect it.

Right now at the time of this writing Orgcoin is trading for 200 satoshi on cryptorush.  We've never pumped this coin.  All promotion has been limited to 1 posting here and 1 over at cryptocointalk. 

We have some pretty lofty goals, and 100% of all profits each month are given to the charity, non-profit or good cause selected by our members.  Please see www.orgcoin.org for more details.  If you have any questions please feel free to hop in irc.freenode.net /join #orgcoin

Thanks everyone for the interest!