rss parsing using XLinq question

Question

So I started learning XLinq last evening and I thought I would try to parse a samle RSS document like found at http://weblogs.asp.net/scottgu/rss.aspx

My test was to find all entries which fit the following criteria

a) Was Posted in the year 2008 b) Had atleast one comment c) Had the tag ".NET"

So I am wondering if my solution(though it works) would be considered a "good solution". XLinq gurus please weight in. Code below

        XDocument document = XDocument.Load(fileName);
        XNamespace dcNamespace = "http://purl.org/dc/elements/1.1/";
        XNamespace slashNamespace = "http://purl.org/rss/1.0/modules/slash/";

        var items = from item in document.Descendants("item")
                    where Convert.ToDateTime(item.Element("pubDate").Value).Year == 2008 &&
                        Convert.ToInt32(item.Element(slashNamespace + "comments").Value) > 0 
                    select new
                               {
                                   Title = item.Element("title").Value,
                                   Link = item.Element("link").Value,
                                   PublishedDate = Convert.ToDateTime(item.Element("pubDate").Value),
                                   comments = Convert.ToInt32(item.Element(slashNamespace + "comments").Value),
                                   Tags = (from category in item.Elements("category")
                                               where !string.IsNullOrEmpty(category.Value) 
                                               orderby category.Value 
                                               select category).ToList()

                               };

        const string requiredTag = ".NET";
        var dotNetTaggedItems = from item in items
                            where item.Tags.Any(x => x.Value == requiredTag)
                            select item;
        if (items.Any(item => item.PublishedDate.Year != 2008)) //Check that the year is valid
            throw new InvalidOperationException("Invalid PublishedDate");
        int totalComments = 0;
        foreach (var taggedItem in dotNetTaggedItems)
        {
            if (taggedItem.comments > 0) //Check that the comments are valid
                throw new InvalidOperationException("Tagged item cannot contain zero value comments");
            totalComments += taggedItem.comments;
            bool found = false;
            foreach (var tag in taggedItem.Tags)
            {
                if (tag.Value == ".NET")
                {
                    found = true;
                    break;
                }
            }
            if (!found) // Check the required tag was found
                throw new InvalidOperationException(
                    string.Format("Tagged item does not contain requisite tag - {0}", requiredTag));
        }