1sockchuck writes "It's crunch time for the Internal Revenue Service. As the IRS processes the annual crescendo of returns around today's tax deadline, the state of the agency's infrastructure depends upon who you ask. IT executives at the IRS say it has made huge strides in modernizing its data centers, which processed 139 million returns and issued $298 billion in refunds in 2009. Independent tests say the IRS web site is the fastest US government site, and one of the fastest on the web. But a key government watchdog, the Government Accountability Office, says the modernization effort hasn't moved quickly enough, and continues to fault the IRS for security weaknesses."