The Timeline....

1. Autumn Time 2007-The Sarah Jane Adventures, Series 1
2. December 25th 2007-Doctor Who Christmas Special
3. January 2008-Torchwood, Series 2 (Assuming Torchwood Declassified will run parallel)
4. Late March/Early April 2008-Doctor Who, Series 4 (Assuming both Totally Doctor Who and Doctor Who Confidential will run parallel)