Although I am open to the possibility of many things, the theory that there were no planes is supported very weakly. Here is the website for Architects and Engineers for 9/11 Truth, a group of over 520 proffessional architects and engineers (along with 2700 supporters) who are demanding a truly independent investigation of the events of 9/11 because of much very strong evidence which indicates that explosives were used to take down WTC 1, 2, and 7.
http://www.ae911truth.org/
On this site, you can watch the presentation by one of the founding members, Richard Gage AIA, in which he highlights the inconsistencies of the "official story" and also presents evidence of explosives used. Richard Gage is speaking in London at UCL tomorrow to give his presentation to many more proffessional architects and engineers and anyone else who wants to come. You can reserve a ticket at gageinlondon.blogspot.com (£5). Show up early if you are going to come! There is going to be a huge turnout.