In the past day or two, I've noticed several bots asking for
/wp-content/plugins/reflex-gallery/readme.txt
which I presume is part of the Reflex Gallery plugin at
<http://wordpress.org/plugins/reflex-gallery/>.
If they're looking to see if it is installed, there is usually bad
intent behind it.
I've used the contact form on the developer's website to let them know,
and sent an email to the relevant address at
wordpress.org, but if you
are using it, it's probably a good idea to disable it until the reason
for this probing is known.
Ian