Ramy,

Your questions are answered in the last half of the front page, and in
the FAQ (http://www.justsoar.com/faq.php). But to answer them
directly:

Does it essentially contain the same info that is available in the
sectionals (including airports, drop zones etc)?

No, not really. Sectionals contain data from many databases --
topology, hydrology, transportation, obstacles, airports, airspace, to
name a few.

If not, what does it or does it not contain?

JustSoar.com only provides airspace, which consists of controlled
airspace (B, C, D class) and restrictive airspace (MOAs, Restricted,
Prohibited, Alert, etc). You get to pick which of those you want
included, and by what geographical area.

Do you know if this is the same source
winpilot uses to provide it's airport/airspace database?

No, I do not know. I do know that before October 2007, many, if not
most or all, software application vendors used the U.S. Flight
Information Files (USFIF) database, which was freely available until
last fall. I have not the slightest clue what they are using now, but
to the best of my knowledge, after talking with some folks at the FAA,
the subscription-required NFD is the only way to get current, digital
airspace data.

Hope that helps. See the web page, especially the FAQ, for more
details.

~ted/2NO