Mining Primecoin with one server and no pool?
pooledtx is likely the number of transactions that are waiting to be confirmed by the next block. These transactions are broadcast to the network and the miners collect them to include them in a block. Since primecoin still has a really low amount of transactions and since your mining a reward transaction this will swing between 1 (just your reward transaction) and 2 (someone just made a transfer).

Since you have a fully fledged primecoin client on your system to be able to mine (primecoind) it will also generate new addresses on demand, and the balance will be credited to those addresses. with primecoind listtransactions you'll see which addresses received the mined amount. You can now use primecoin sendtoaddress &lt;primecoinaddress&gt; &lt;amount&gt; to send any amount to an external address, i.e. your multibit client.