If you've ever tried to upgrade the kernel on a SheevaPlug, you know that sometimes flashing from within Linux doesn't work, and will leave the plug in an unbootable state. Here's how I recovered from a bad flash, using U-Boot to flash a kernel image stored on a USB drive. In this case I'm flashing a custom-compiled 22.214.171.124 with the realtime patches (2.6.34 and newer seem to have problems with USB audio on the Sheeva). This guide assumes you know how to get into U-Boot. Help for most commands is available by typing help command.
Ever since I built my last desktop computer, I had problems with the Compiz-powered visual effects in Linux. They mostly worked fine, but every effect would start with a few fluid frames, completely pause for a noticeable fraction, then complete the animation. This was particularly distracting when switching virtual desktops with the cube plugin. I think it all started with my then-new Athlon64 X2 6000 @ 3GHz. I was (and still am) running dual Nvidia 8800GTs, I had plenty of RAM, but nothing would get rid of this stuttering problem.
Update 2013: I'm still running the startup that was rejected: Nitrogen Logic
Good news! I have completed another iteration of the Y Combinator application process. Though my application was not accepted for this summer's funding round, I have gained some valuable insights into the funding process. I'll share these insights with you by listing differences between my last application and my current one and describing the apparent results of those changes.
I spent some more time using the Mac today. I customized the Terminal color scheme and behavior (the "Pro" preset was a good starting point), reduced the size of the Dock icons, and other customizations. It turns out that you really can't set a custom solid color as your background Mac OS X, and it's always been like that. A common workaround is to save a transparent PNG or TIFF image, set it to center, and then OS X will let you choose a custom desktop color.
So I finally got around to buying a Mac mini. I bought it so I could decide for myself if all the Apple hoopla is warranted, and so I could port some of my software to it. I have to say, I'm disappointed.
Is there a decent panel applet RSS reader for Linux? I've been using Firefox add-ons, but I've decided I want notifications of new items even when I'm not running Firefox. The feed readers I've tried so far are unsuitable for various reasons.