I made a live Google doc (think it updates ~every 5 mins, not sure) showing the best rate you can get buying or selling BTC at the largest exchanges. Non USD exchanges are converted to the equivalent USD rate using the Google finance rate. No accounting for fees or transactions fees (if converting from USD to GBP for example) are made. Didn't include virwoxSLL as don't think Linden dollars are listed in Google finance.https://spreadsheets.google.com/spreadsheet/pub?key=0Arbegqx_2nKadElRaFlBYWljTURCMGl0R3prTkZsU2c&single=true&gid=1&output=html
The best rates should appear in order in the list.
Any thoughts why b7USD is so far off the other exchanges?
Must give a hat tip to ChocoboLee and this topic http://forum.bitcoin.org/index.php?topic=23422.msg294171#msg294171
, as I copied many of the ideas there. never knew Google docs could be so powerful.
try it out and let me know what you think.