In wallet, go to console and type 'getinfo'

Help-> Debug Window -> Console : type getinfo

{
"version" : "v0.4.1-nvc-33-ga1d933e-beta",
"protocolversion" : 60006,
"walletversion" : 60000,
"balance" : 901.13460500,
"newmint" : 0.00000000,
"stake" : 181.43851000,
"blocks" : 44457,
"moneysupply" : 24740.12928600,
"connections" : 8,
"proxy" : "",
"ip" : "81.38.70.164",
"difficulty" : 3.85094377,
"testnet" : false,
"keypoololdest" : 1368694821,
"keypoolsize" : 101,
"paytxfee" : 0.00000000,
"errors" : ""
}

The money supply today is approximately 24,740 BTG and not going to see many more ...