My advice is to keep trying - I'd sent absolutely loads of applications out for months, and then had three interviews in one week. Also, don't be too over-ambituous - I have loads of undergrad and postgrad teaching experience, and was applying for lectureship positions that said they would accept applications from those nearing completion of a PhD, which gave me some hope, but they would still prefer someone with further post-doc and teaching experience. Good luck though - these things have a way of working themselvs out!