Not technically a fic rec, but when I read this I had the feeling that everyone here would appreciate it. It's an article from a site called Listverse, and does exactly what it says on the tin.
10 Terrifying Downsides to Immortality Anyone who reads a lot of spitefic will also doubtless recognise some of these facets as having been touched on by writers before. But it's an amusing list to ponder whilst thinking of the Cullens, and especially our, ahem, lovely Bella...
Uncertain of how to tag, but I hope this is appropriate enough for this comm.