What is working?
Here is the project file for your taste. You should change the delicious login for your own taste though(in getDelicious class), otherwise it doesn't work.Right now I am able to send a query to delicious API and search for this "keyword". The problem is since the API only allows me to search in the boundaries of tags, It doesn't mean anything to search for a keyword, we can only search tag keywords. This option can be improved by adding another search box and making a drop down of tags to be choosed from delicious. That way we can search for keywords in certain pages that is related to delicious tags.
We can see how many times that tag name appears in the page that is tagged.
We can run multiple search queries, the new ones will appear below the old ones.
Possible Future Scenarios
As we can see, right now our tool looks more like a listing tool than a visualization tool. So future goals are listed below:
1- Withdrawing the use of API from the project and stick to good ol' RSS(well not so old.) So that we wouldn't be stuck wandering around only with our own tags.
2- We can then bring new data to the project i.e: Listing common tags for certain urls, related tags of certain tags, user profiles according to their tag listings and so on.
3- Since one of the most important thing for me is how I display the data, I want to spend more time thinking how I can display such data I have been collecting over delicious. Right now I have been thinking using a spring-node approach which I think is suitable for this kind of data display. See above figure for details.

References:

1- Delicious API
ilteris ‹at› gmail ‹dot› com - Programming from A to Z