JoJo writes: "Now that Citigroup has posted its first quarter earning for 2008, do you still stand by your original analysis, or you think you have to revise it?" Thanks for getting my butt in gear for the update I promised, JoJo. As many of you may know, Citigroup (C) reported a loss of $5.1 billion in the first quarter, which hardly makes it easy to figure out what a more "normal" quarter would look like for them. While the losses and writedowns did go down in Q1, versus Q4, there is still plenty of cloudiness in Citi's results. Nonetheless, there is no point in shying away from digging through the numbers, even if they are complicated, which is why I even bothered writing about Citi in the first place. The first thing I did was update my spreadsheet showing Citi's quarterly income results by segment going all the way back to 2007. This ...