I am (was) a very heavy delicious user. Luckily, I backed up my delicious bookmarks a few weeks ago. The export function on the new site doesn't seem to work and if it does, I doubt all my bookmarks will be there.
I started typing out a long laundry list of issues, but it doesn't matter. Suffice it to say the new site is nearly unusable. There is nothing new that is useful for users or that would attract new users, nor is there any revenue model in sight.
I would be surprised if more than 10% of past delicious users stay with the site.
I can offer a data point: I was able to export my data from the new delicious on tuesday (after noticing the changes) and then import it into a new pinboard account with no issues or anything missing (998 bookmarks and 2748 tags). maybe I was lucky!
I guess you were lucky, or I might be very unlucky. I think the problem might be I have close to 20.000 bookmarks, most of them neatly organized and tagged. The export chokes after a minute or so and just shows a blank page. Grabbing via the API (using curl or WGET) gives me a very incomplete dump.
Last export I did was earlier this summer. I never imagined they'd screw up so bad. Now they don't even reply to my e-mails.
Another data point. I have had no problem with my existing links (1697 of them that all seem to be present), exporting said links and have had no problems logging in or using my existing id and password.
I was an early Delicious user and have 7000ish bookmarks in there which I tend to frequently. I hadn't seen or experienced any significant reasons to leave yet. I can still tag stuff, still look up links by tags.. that's pretty much all I used it for anyway.
However, if export is broken/not going to work, that changes things a bit. While I do backup every few months, having no guarantee I can save future links almost invalidates the whole idea.
I started typing out a long laundry list of issues, but it doesn't matter. Suffice it to say the new site is nearly unusable. There is nothing new that is useful for users or that would attract new users, nor is there any revenue model in sight.
I would be surprised if more than 10% of past delicious users stay with the site.