Theories as to what the Kecksburg object (if there was one- reports vary) range from it being an alien craft to the nosecone of a Soviet probe, Kosmos 96 that was destined for Venus.
There has been a recent push for NASA to release pertinent documents on the subject. Some 40 pages of these documents were released on November 1, 2003, but are unrevealing.
Similarities have been drawn between Kecksburg and the Roswell UFO incident.
http://ufocasebook.com/Kecksburg.html
http://www.ufocasebook.com/Kecksberg-UFO.pdfSee also