There is no reason why you can’t use this implementation of Simpy to bookmark your blog posts.
If you view [this example] you can see a tag cloud generated from Simpy, and also a search box, exactly what I want to do in my blog, but wait there is more.
If you do a search or click on a tag from the tag cloud the results are shown within the blog, this is amazing, so now you can point your tags to an external site like Simpy, Technorati will still pick it up ( as long as you use rel=tag), and you are not pushing users away from your site as you can view results from the tag cloud within your site and not at Simpy.
I'm not sure whether the in-post results on the example blog are possible because it is hosted on a private domain, & whether the same functions could be duplicated on blogspot, but I will be checking into it.....
Filed in: blogtech, tags, categories, simpy, del.icio.us
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That's not saying Simpy is on the right track here -- http://www.simpy.com/simpy/service/api/rest/ looks promising, and there are certainly much room left for improvement on easy integration over what Del.icio.us already offers. Maybe I ought to look into this, too -- from Otis' response, it seems easy to get in touch with the developers, suggesting additional improvements.
Come to think of it, there might be a good idea for me, as Del.icio.us goes, too; it hasn't struck me I ought to provide som user land tech feedback. :)