Are any alts worth the bother?
Sure, but that's a matter of opinion.
LiteCoin is on a decline, but has a decent foundation and should bounce back (a least a little).
Aside from that, all opinion. DevCoin and NameCoin shouldn't be going anywhere, because they can be merge mined along with BitCoin, so they'll always be actively mined. WorldCoin seems to have held value fairly well compared to the new batch of alt coins, the rest are sort of all over the map.