Is there somewhere I can see subscriptions I have pending? I just keep searching for different communities and hitting the sub button, but not all have subbed. I'm guessing I'm in the same boat as you but I don't remember what they all would have been now.
At the top of the home page, click the word "Communities"
On the resulting page, click the word in the box "Subscribed" and you will see what you are subscribed to, "Pending Subscription" will show in red in the last column.
You can subscribe to the unsubscribed communities by clicking the word Unsubscribed at the far right.