Can I filter the questions with particular tags from the Questions list?
In addition to the search filtering that Flow mentions, you can also set up "favorite" and "ignored" tags from the right sidebar on the main page. Ignored tags will be faded grey on the question lists and favorited ones will be highlighted.
Sure, simply enter [tag] as search option. It's also stated here.
For example, if you want to search for all questions tagged samsung-galaxy-s, you would enter [samsung-galaxy-s] in the search field: Result
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1If you want to exclude an tag, add an minus sign ("-") before the [tag]. See also meta.stackexchange.com/questions/24514/… – Flow Feb 6 '12 at 13:45