Xmarks
A year or two ago, I used Foxmarks to keep my desktop and laptop machines synced. Then Foxmarks became Xmarks, and I carried on using it.
Late last year, I got an e-mail from Xmarks saying they were packing up, and recommending I switched to Firefox Sync (which I did). It doesn't seem as consistent - its automatic updates failed to do the job a couple of times that I've noticed recently, although a manual sync worked.
Last month I got an e-mail from Xmarks, telling me all about the new product etc. Are they back from the dead? Should I celebrate?