I/me/my/mine/myself
you/your/yours/yourself (singular)
he/she/it/his/hers/its/himself/herself/itself (sex-specific or one epicene pronoun? Or both?)
we/us/our/ours/ourselves (inclusive and exclusive?)
you/your/yours/yourselves (plural)
they/them/their/theirs/themselves (if singular forms are sex-specific, are the plural forms also?)
If you'd like to argue in favor of not having any personal pronouns at all, bring it on!

this
these
that
those
(Include and explain distinctions. For instance, Nevashi has a 4-way distinction based on where the thing being spoken about is relative to the speaker and the addressee. For all we know, our language may distinguish between "this, IRL" and "this, on the Net".)
a, an
the
and
or
but
(Just a personal note: I rather liked the idea of having a simultaneous-and and a sequential-and... simultaneously.)
after
before
unless
although
if
until
as
since
when
because
than
while
There's not a lot of content in this group, but I wanted to throw this out there for people to think about. If someone else wants to post another thread that includes more content words (verbs of motion, common transitive verbs, animals, flavors of ice cream, whatever), that would be great.
I will be submitting my own proposals for this and other things before the end of the weekend. I am in a conlanging mood.