You're starting from a very different point, to make it easy for people who know one book to learn of the series and translations. Watch Patrick McKenzie's talks on SEO and scalable content generation. Even with LT and Delicious Monster (the other big personal library software), you can get a significant amount of traffic. Make an attractive page and get the SEO right and you could have a great steady income in affiliate fees for a low time investment.
(Hell, if you get totally discouraged and decided to drop it, email me. Maybe I'll build it in my Copious Free Time. :)
People dislike a site (or company) for many reasons - poor search, navigation, layout, bugs, etc.
Again, just because there is Honda, doesn't mean there isn't room for Toyota and Hyundai, etc.
I'm constantly looking for alternatives to existing software/sites. Unless you have a competitor like Amazon, I think you should go ahead and do what you _want_ to do.
If you have a great interest in this idea, follow it through. At worst you make it open source. If you are interested anymore, dump it.
I've decided to continue working on the site for now, and see how it goes. Maybe if I do a bit of advertising and my visitor numbers start to increase, my motivation also increases.
I do programming for fun, after my $dayjob. I've had this great idea for a website that shows you which book form a logical series (for example the seven "Harry Potter"), so that you can look up the sequels to a book.
A while back a found a site which has been doing that for a while [1], but that was OK - I didn't like that site's layout and search function, and their license allowed it for me to just import their data.
But this week I found another site which does the same thing [2], and they do it really well. Moreover they have been doing that since 2006, have 8 employees and 1 mio signed-up users. But most importantly they already have a huge data set. Quite a head start. They have also implemented some ideas I've had for getting some revenue (organizing your own library online, freemium model).
Compare that with what I currently have [3], I've worked on that for about half a year now in my not-so-copious free time.
So I'm pretty demotivated right now. I wouldn't mind competing with another site if I thought I did it better than they do, but currently I don't think so. The only thing I do better is presenting translations (though I don't have too much data for that yet), but I don't think that'll be a major selling point.
So, what should I do? Should I just chuck out what I have now and turn to a differnt project? Or compete nonetheless? Or maybe focus on the German market (I live in Germany)?
I want to build something that people are happy to use and find useful, if it turns out profitable in the end that would be nice, but that's not my main priority.
[1] http://www.isfdb.org/cgi-bin/pe.cgi?7167
[2] http://www.librarything.com/series/Harry+Potter
[3] http://quelology.org/t/9684
P.S. yes, I know, I should have searched for other sites more carefully when I started. Classical market research fail.
Do something you really care about and that solves a problem for someone. Finding sequels to books is not a problem I think anyone has.
I'd say you can't compete directly with librarything.