What is samadhi? Are there two levels of it Yogani? thanks.
Hi Neptune:
Samadhi is the eighth limb of yoga and means “absorption in pure bliss consciousness,” or “abiding in inner silence,” “the witness,” “stillness in action,” etc., all which we talk about so much around here from an experiential perspective. Everyone who loses the mantra during deep meditation enters samadhi.
There are as many types and grades of samadhi as one might care to define, and it can get very technical in splitting hairs. It really depends on experience. Before then, it is mostly academic.
See these links:
http://www.aypsite.org/forum/topic.asp?TOPIC_ID=2314
http://www.aypsite.org/forum/topic.asp?TOPIC_ID=667
http://www.aypsite.org/248.html
Carry on! 
The guru is in you.
and see also this one: http://www.aypsite.org/forum/topic.asp?TOPIC_ID=2687
Found the above topics very interesting as well as these ones below:
Nirvikalpa Samadhi, Nirodha Samadhi:
http://www.aypsite.org/forum/topic.asp?TOPIC_ID=2897#2897
Sahaja samadhi:
http://www.aypsite.org/forum/topic.asp?TOPIC_ID=7708&whichpage=2
Thought it reason enough to revive the topic
So many gems on this forum, topics and people…
Thanks to all those contributing! 
body gets stiff like a board, immersed in omkar tone, then boom ure not there u come out with an exhale. was i even breathing?
Samadhi is a state of mind where there are absolutely no thoughts present, even one thought that I have no thoughts is not there. Total awareness only. We all go to this state in our sleep but only for a few minutes the only difference is we are not aware, it just happens.