SharePoint 2010: code for dumping a taxonomy tree

Just customize the data you need from each node type (store, group, set, term).

        private void DumpTaxonomy(string siteUrl)
        {
            Stack<string> stack = new Stack<string>();
            using (SPSite site = new SPSite(siteUrl))
            {
                TaxonomySession session = new TaxonomySession(site, false);
                int nts = 0;
                foreach (TermStore ts in session.TermStores)
                {
                    nts++;
                    int ng = 0;
                    foreach (Group g in ts.Groups)
                    {
                        ng++;
                        int ns = 0;
                        foreach (TermSet s in g.TermSets)
                        {
                            ns++;
                            int nt = 0;
                            foreach (Term t in s.Terms)
                            {
                                nt++;
                                DumpTerm(t, stack, 4);
                            }
                            stack.Push(ReportNode(3, nt));
                        }
                        stack.Push(ReportNode(2, ns));
                    }
                    stack.Push(ReportNode(1, ng));
                }
                stack.Push(ReportNode(0, nts));
            }
            while (stack.Count > 0)
            {
                Console.WriteLine(stack.Pop());
            }
        }

        private void DumpTerm(Term t, Stack<string> stack, int level)
        {
            int nt = 0;
            foreach (Term children in t.Terms)
            {
                nt++;
                DumpTerm(children, stack, level + 1);
            }
            stack.Push(ReportNode(level, t.Name + " " + nt.ToString()));
        }

        private string ReportNode(int level, object children)
        {
            StringBuilder sb = new StringBuilder();
            for(int i = 0; i < level; i++)
            {
                sb.Append("\t");
            }
            sb.Append(children);
            return (sb.ToString());
        }