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Delicious Mobile lets you perform tagging, bookmarking related tasks as well as checking your system inbox. Site browsing is also an option, which allows you to get rid of your phone’s bookmarks (in most cases, this is a blessing) as well as “tag-stalk” your friends and see what they’re reading.
They also expressed intent to integrate their social search engine as well in the next iteration of the mobile service.
As someone who just re-entered the mobile device world, I can attest to the lack of usefulness most mobile device browsers possess, so replacing my bookmarks with Delicious functionality is certainly a soft sell.