Mint 10's LXDE/PCManFM desktop seems solid enough to me. I don't
detect any 'weakness' in its handling of X-duties over several days
and several boot-ups. Never had an occasion where I needed ctl-alt-
backspace or a re-boot to recover my control over the X-territory.

There is an inconsistency though that is hard to overlook.
Mint has many nice GUI amenities; many, I suppose depend on
the Gnome infrastructure. The whole purpose of the LXDE
approach was to get away from Gnome and/or KDE infrastructures'
demand on computer resources.

In comparing Knoppix 6.4 USB with Mint 10 LXDE USB, therefore
we find that 2 Gb will suffice for Knoppix, but 3 Gb is required
for Mint. Of course you can't buy 3 Gb, you have to buy 4.
Considering the array of amenities, an 8 Gb install might even
be preferable to sample all the offerings. But then why would you
need a lightweight desktop in this situation. Takes all kinds, I guess.

This experiment has exploded my prejudice that LXDE/PCManFM is
inherently disposed to a weakness, which I've nick-named 'Fragile-X'.
In my 2 Gb Knoppix 6.4.4 USB I occasionally have a hang-up in X which
requires ctl-alt-backspace to recover. Occasions that require a
full re-boot are quite rare, but they do occur.

I now expect this 'weakness' may be unique to my own usage pattern or
installation history, rather than unique to the basic design. I do know
I'm not the only one having similar occasional problems, but that doesn't
explain what's going on. 'Fragile-X' is a fact in my install, but just
what does explain the phenom is unknown at present.