If you take a close look at the original input html source, you will see its data is organized around 6 main sections that are DIV html elements with one of the following 'id' attributes: "incinterimdiv" "incannualdiv" "balinterimdiv" "balannualdiv" "casinterimdiv" "casannualdiv". Obviously, these matches Income Statement, Balance Sheet, and Cash Flow for Quaterly or Annual Data.

Now, when you're scraping a site with Html Agility Pack, I suggest you use XPATH wich is the easiest way to get to any node inside the HTML code, without any dependency on XML, as Html Agility Pack supports plain XPATH over HTML.

XPATH has to be learned, for sure, but is very elegant because it does so many things in just one line. I know this may look old-fashioned with the new cool C#-oriented XLinq syntax :), but XPATH is much more concise. It also enables you to concentrate the bindings between your code and the input HTML in plain old strings, and avoid recompilation of the code when the input source evolves (for example, when the ID change). This make your scraping code more robust, and future-proof. You could also put the XPATH bindings in an XSL(T) file, to be able to transform the HTML into the data presented as XML.

Anyway, enough digression :) Here is a sample code that allows you to get the financial data from a specific line title, and another that gets all data from all lines (from one of the 6 main sections):

        HtmlWeb web = new HtmlWeb();
        HtmlDocument doc = web.Load("http://www.google.com/finance?q=NASDAQ:TXN&fstype=ii");

        // How get a specific line:
        // 1) recursively get all DIV elements with the 'id' attribute set to 'casannualdiv'
        // 2) get all TABLE elements under, with the 'id' attribute set to 'fs-table'
        // 3) recursively get all TD elements containing the given text (trimmed)
        foreach (HtmlNode node in doc.DocumentNode.SelectNodes("//div[@id='casannualdiv']/table[@id='fs-table']//td[normalize-space(text()) = 'Deferred Taxes']"))
        {
            Console.WriteLine("Title:" + node.InnerHtml.Trim());

            // get all following sibling TD elements
            foreach (HtmlNode sibling in node.SelectNodes("following-sibling::td"))
            {
                Console.WriteLine(" data:" + sibling.InnerText.Trim()); // InnerText works also for negative values
            }
        }

        // How to get all lines:
        // 1) recursively get all DIV elements with the 'id' attribute set to 'casannualdiv'
        // 2) get all TABLE elements under, with the 'id' attribute set to 'fs-table'
        // 3) recursively get all TD elements containing the class 'lft lm'
        foreach (HtmlNode node in doc.DocumentNode.SelectNodes("//div[@id='casannualdiv']/table[@id='fs-table']//td[@class='lft lm']"))
        {
            Console.WriteLine("Title:" + node.InnerHtml.Trim());
            foreach (HtmlNode sibling in node.SelectNodes("following-sibling::td"))
            {
                Console.WriteLine(" data:" + sibling.InnerText.Trim());
            }
        }