Rabid demand for the iPhone has emptied not just the company’s physical retail outlets, but its online store as well. “We continue to see extremely high levels of demand for the iPhone which means it comes in and out of stock very quickly and will be why the Web site hasn’t had any since Monday,” an O2 spokesperson told the Telegraph.

News of the shortage comes just days after O2 rivals Orange and Vodafone both announced plans to carry the iPhone later this year, bringing an end to O2’s exclusivity deal with Apple (AAPL). If Apple is unable to meet consumer demand with just a single U.K. carrier, how will it cope with three?

A reasonable question, but one for which Apple presumably has an answer. Said Forrester (FORR) analyst Mark Mulligan, “I don’t think [Apple] would expand if it couldn’t meet consumer demand, as that would lead to extreme consumer dissatisfaction–which compared to its peers, Apple is usually good at avoiding.”

That’s the word from Gartner, which back in March was claiming the decline would be just 3.8 percent. The research outfit said Tuesday that it expects tech spending to fall to $3.2 trillion this year, down from $3.4 trillion in 2008. And it sees all four major segments of IT–hardware, software, IT services and telecommunications–suffering revenue declines in 2009 (click on chart below).

“The forecast decline in spending growth for the hardware and software segments in 2009 has almost stabilized, and only minor downward revisions have been made to these forecasts this quarter,” said Gartner’s Richard Gordon. “However, the full impact of the global recession on the IT services and telecommunications sectors is still emerging, and forecast growth in these areas has been further reduced significantly.”

That said, the company sees a rebound of 2.3 percent in 2010.

Gartner (IT) is the latest research firm to temper its projections for information technology spending this year in light of the ever-souring economy. Last week Forrester (FORR) lowered its expectations for 2009, saying the first two quarters of the year were worse than expected and that the decline will carry out for the rest of the year. It did, however, say we can expect a rebound in 2010.

We’ve hit bottom. Finally.

In its latest “US and Global IT Market Outlook” report, Forrester (FORR) says information technology spending in 2009 will fall 10.6 percent in 2009. And while that’s far worse than the three percent decline the research outfit forecast at the beginning of the year, it’s also the nadir of this particular crisis, and we are at the beginning of a rebound that will gain momentum in 2010.

According to Forrester, anyway.

“While Q1 2009 saw a scary drop in purchases in the U.S. tech market, ironically that is good news for the long run and we expect to see a stronger rebound sooner,” Forrester analyst Andrew Bartels said in a statement. “The big drops are not precursors to further declines; rather, we think they are evidence of a temporary pause in U.S. tech purchases, which we expect to start recovering in Q4 as businesses realize that they overreacted in the first quarter.”

So after a year of gloom and doom, things are beginning to look up.

Ah, one-click cinema. Seems that Amazon’s finally realized that there simply aren’t enough media junkies to support the download model it embraced with Unbox. “The people who pay to download video are extreme media-philes,” Forrester (FORR) analyst James McQuivey told Variety last year. “They are not the tip of an iceberg. They may grow their own spending, but there aren’t many people like that left. In the video space, iTunes (AAPL) is just a temporary flash while consumers wait for better ways to get video. They’re already coming.”