Although it was cloudy, he was uncertain that it would rain.
Although answering all the questions on wikianswers.com would be impossible, answering a few would be feasible.
They were happy although they were poor.
Yes, typically you would use a comma after "although" when it is used at the beginning of a dependent clause to introduce contrast or concession. For example: "Although it was raining, we still went for a walk."
yes
"although she came second in the competition, not coming first ruined her self esteem"
Although I think I could probably jump over an alligator, I wouldn't risk it.
Although they were accusing her of several heinous crimes she answered all of their questions with total probity.
Although it's raining, we can still go out to play.
Although it is raining, I decided to walk outside anyway.
Although difficult, it's not impossible.
Although he studied at St. Helens college he was informed that Liverpool University would accredit his degree.