I have had a similar issue as you and a bunch of other posts. After my update, which went fine, my computer started occasionally going black with a single line vertical line of pixels on the leftmost side of the screen. Once in a while it will do the whole Kernel Panic with the mult-language screen. This started within a short time after my EFI update, and I NEVER ONCE even had a crash on this machine before.
I'm so ticked!!! I have been on the phone with Apple support, and they sent it to the system engineers because the main technicians have exhausted all of their possible fixes. I even re-installed LION using the internet recovery option. At least now I have a fresh clean install of Lion, not an upgrade from Snow Leoppard.
But, two times during the Lion internet recovery while it was still doing the initial load of files from the internet it crashed with the black screen mentioned previously. This is so very frustrating.
I should hear something tomorrow I hope from the technicians at Apple - I'm sure I'm going to have to take this to a support center and have the motherboard replaced because the EFI is not reverseable. Once it's done it can never be undone, according to what I have read anyway. Doesn't make any sense, on a PC, system Bios can be downgraded which is really the same thing or very similar.
Apple makes a pretty good product, but it seems over the years they have a habit of shooting themselves in the foot and alienating customers because of stupid pet tricks like this. 🙂
OH well - I'll stop whining now. If anyone actually figures out how to fix this I'd love to hear how!!!