Here Matthew Lundin reported Flyspell highlighting URL components:
http://www.mail-archive.com/emacs-orgmode@gnu.org/msg14029.html

The issue should be fixed according to the thread, but URLs like
http://example.com/foo_blarghaa still cause problems ("blarghaa" is
highlighted by Flyspell).

For the wishlist, it'd also be nice to exclude "#+FOO" options from
flyspelling, since they tend to get highlighted when writing non-English text.

Thanks a lot!

::

  Ivan Vilata i Balaguer -- http://ivan.lovesgazpacho.net/