http://www.bodleian.ox.ac.uk/wiser. There are a lot of useful hour-long sessions on finding resources and managing your research, all free and taking place at OUCS on Banbury Road.
Throughout the term I will publish weekly updates of upcoming courses here on this blog. You can also subscribe to the WISER mailing list yourself (send an email to email@example.com), or keep up to date via the WISER blog or Twitter. The WISER blog also includes lots of extra information and tips about finding information, using resources, and managing your research, so is well worth a look!