trekker and trekkie are co-existing terms. trekker is considered to be the more die-hard trekker. A common example is a trekkie will wear a pair of vulcan ears to a trek convention and think he's cool. A trekker will wear full Klingon battle dress, Klingon makeup including the bumpy head prosthesis, and carry his own Bat'letlh, just to go to the latest Star Trek movie (or sometimes just to go to the video store and rent an old star trek movie ;)

I fit more in the trekker category because i did go to First Contact in full Klingon battle dress and makeup, tho I had to leave the Bat'letlh in the car because the ushers wouldn't let me take it into the studio. I also own the Next Gen Technical Manual, the blueprints for the 1701-D, the model, the Klingon/English dictionary (revised edition), the Klingon language tutorial CD-ROM, The Physics of Star Trek, The Nitpicker's Guide for Next Generation Trekkers, volumes 1 and 2, and have every Next Gen, DS9, and Voyager episode on tape.

*grin*