I suppose saying I've been a fanfic reader and writer for more than a decade, now, would be... well, master-of-the-obvious territory, here?
I started off my fanfiction writing career with Ranma. Branched off into Patlabor, Irresponsible Captain Tylor, Bastard!!, Ushio and Tora, Slayers, Kenshin, Princess Mononoke, Kimagure Orange Road, Voltron, DBZ, a little dabble into Harry Potter before the sixth book killed all of my flagging interest in the series, and finally, about two and a half years ago, Naruto (roughly in that order).
I also read fanfiction -- in some cases very sporatically and VERY selectively -- for Inu Yasha, Full Metal Panic, Teen Titans, Jonny Quest, Young Wizards, 3X3 Eyes, TitanAE, Chrono Trigger, Disney's Atlantis, "Disney's" Gargoyles (the quotes because, well, it was largely only tangentally Disney's until the third season, which was a complete disaster and killed the series), Ah! My Goddess (or Oh! My Goddess, depending on what version\translation you are reading\watching), Lois and Clark, Nuku Nuku, and... um, well, I would read fanfiction for Tom Swift (Sr. or the 'Wanderer' paperback set, but not Tom Swift Jr. or the Tom Swift Archway franchise) or Scarecrow and Mrs. King, if I could find any that was any good. (I'd probably WRITE fanfiction for Scarecrow and Mrs. King, but I once held a job with the government that would require I report said fanfic and get 'approval' to publish it; not exactly a wise move for such a grey legal territory as fanfiction).
A larger percentage than I'd like of my fanfics are unfinished, and likely will forever remain unfinished. I definitely will
finish Training for the Job, and will do my best to finish my Patlabor fanfic ("Patlabor: Personal Files"). I have high hopes of continuing, whether to conclusion or not, my Voltron fanfic ("The Alliance is Dead, Long Live the Alliance"), my Kenshin fanfic ("Guide in the Wilderness"), my Slayers fanfic ("Titled," a play on 'untitled' as there was an archive I wanted to submit it to untitled that insisted I give it a real name, some years back), and my Kimagure Orange Road fanfic ("The Rebel Esper"). I have slim hopes -- but still some hope -- of continuing my DBZ fanfic ("A Thousand Years Until Revenge"), my Irresponsible Captain Tylor fanfic ("Tylor's Fury"), my Ushio and Tora fanfic ("Discoveries"), and my Princess Mononoke Fanfic ("Untitled").
People who have been following me from the beginning may be surprised at some of those (Discoveries and The Rebel Esper are both barely started, and haven't been touched in this millenium outside of being posted to FF.net when I first opened up my account on the site, yet they're still more likely than some others), and may be disappointed about others: None of my Ranma fanfics are likely to be continued, despite my remaining a fan of the series. Also, outside of one one-shot which may or may not be on an old pairing site I haven't visited in years, my Harry Potter fanfics have been wiped off of all fanfic archives which I can access, and I can guarantee I'll never work on them again, which may disappoint some people who were into kinky sex between Harry and Hermione or who like Ron being involved in orgies.
Hey, the principle HP fanfic I did was written to meet a Harry\Hermione fansite's 'Kinky Sex' challenge, combined with a 'Harem' challenge on said site... which disallowed harem fics involving the pairing it said it "shipped," but allowed harems for non-shipped couples.
I'm also trying to write professional fiction, mostly in the military science fiction or the high fantasy genre, but to date merely have an ongoing contract negotiation I can't discuss and a short story that was bought but never published to show for it. (On the plus side, I've only had one rejection letter to date for either of my novels, and both are with seperate publishers -- one still being considered, the other being the one I'm in negotiations on). The results of these contract negotiations may actually effect whether I can afford to finish certain of the 'less than definite but still want to try and work on them' fanfics or not. Ah, well -- the price one pays to 'go pro.'