Chrome's bookmark sync is not foolproof yet -- I've never lost a bookmark, but I get dupes all the time (usually after renaming a bookmark: the old name comes back as a duplicate).

Very true, and don't bother to use xmarks with google chrome sync. It will keep on duplicating every time. Making multiple copy of the bookmarks.

I can use pinboard (and similar) on any browser and any platform, including a simple API to do custom stuff, if I want. Much more portable.

I kinda like firefox, but this might make me change to chrome though.

And welcome to hacker news :-)

Firefox 4 also has built-in sync (of bookmarks, history, and some configuration stuff if you like), so not the best reason to switch :P Go to Preferences->Sync to set it up.

(It requires both a password and a sync key because they store all your data encrypted. The sync key is used to decrypt it client-side.)

Several months ago I lost bookmarks with Chrome sync. I think I did something weird, though, like go from developer-channel Chromium to stable Chrome.

Prior to 14 day ago, minmax could say the same thing about Delicious...

Yeah but what can I say, I'm a Google fanboy.