This draft shows a portion of the Y chromosome tree in extension to Karafet et al.  and the ISOGG tree 
I have added the recently discovered SNP markers and I implemented the topology from our latest evaluation runs. Some positions on the tree are only verified by single samples. Additionally I have marked the uncertain assignments which are either work in progress or which cannot be tested by our laboratory due to missing control samples. More information on the SNP details can also be found at Ymap.
Note that because I'm frequently updating the tree you may need to refresh the web page to see the latest version. Most browsers cache the graphics from the first visit.
Working Draft of the Y Chromosome Tree Below J-M304 by Thomas Krahn is licensed under a Creative Commons Attribution-Noncommercial 3.0 Germany License.
Many thanks to all voluntary participants of the genealogical testing community for sharing their testing data from deCODEme and 23andMe chips and some of them providing control samples for my evaluation test runs. Special thanks also to Alfred Aburto and Bonnie Schrack who identified the new SNPs as useful tests for DNA genealogy, pre-selected useful samples and helped me to refine the topology by cross checking all sources. This work wouldn't have been possible without the great spreadsheets from Ann Turner and Adriano Squecco who collected the SNP data from the volunteers that payed for their own DNA tests and made them available to the public.
The credit for discovering the importance of the L27 marker (rs34126399) goes to Dr. Roy King who has published his findings in his Spittoon article  on Jul. 25th 2008.
 Karafet T M, Mendez F L, Meilerman M B, Underhill P A, Zegura S L, Hammer M F, (2008). New Binary Polymorphisms Reshape and Increase Resolution of the Human Y-Chromosomal Haplogroup Tree. Abstract. Genome Research, published online April 2, 2008
 International Society of Genetic Genealogy (2009). Y-DNA Haplogroup Tree 2009, Version: 4.04, Date: 15 January 2009, http://www.isogg.org/tree/
 King R. The Origin of Farming in Europe: A View from the Y Chromosome, The Spittoon, Date: July 25th 2008, http://spittoon.23andme.com/2008/07/25/the-origin-of-farming-in-europe-a-view-from-the-y-chromosome/