Pop over to Sue Moorcroft's blog for some wise words on epilogues.
The last few books I've read (currently half-way through and loving Number Ten by Sue Townsend) there's been a prologue and an epilogue. My own novel has both, though they're quite short.
I wish I could recall which agent it was who said he liked neither and most agents he knew felt the same. Bit of a sweeping statement and probably just a passing trend as with all things literary. Anyway, whatever the current trend, I'm sticking with mine. One agent I sent my novel to remarked that he liked my epilogue and the fact that it's title is 'The Beginning'. Pity he didn't like the preceeding 300 odd pages as much!