Sorry to hear of more troubles with LXDE

I'm not sure what could be causing this. Does it crash before you enter your password or after? If it crashes, can you still go to the virtual console with Ctrl+Alt+F1? If that still works, follow below tips from the virtual console and don't go the GRUB recovery mode route.
If it crashes before you enter your password, it is likely related to something recently upgraded or installed on your system. Linux Mint 11 received a new kernel (2.6.38-15) on Thursday, so that might be the cause. You might try from the GRUB menu (hold shift during boot to show it) to boot with an older kernel version. If it doesn't help (or you don't have 2.6.38-15 yet), boot into recovery mode from the GRUB menu, drop to the root console, and have a look at recently updated packages:
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grep " upgrade " /var/log/dpkg.log
or if you suspect it to be something you installed yourself recently:
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grep " install " /var/log/dpkg.log
Anything "linux" or "xorg" or other graphics card driver related would be suspect.
If it crashed after you enter your password, it is likely related to something set for your account. You might try creating a new account and seeing if that will work? Suggest to add it as an admin, so you can use sudo and such. From the GRUB recovery mode > drop to root console, do:
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mount -o remount,rw /
adduser username --group admin
or from the virtual console, do:
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sudo adduser username --group admin
Where you replace username with your chosen name for the new account (IIRC, must start with a-z, though from the second character may also have digits, but all lower case).