Landau is a member of the Actors Studio and as recently as of 2008 was being mentored by Mike Medavoy.
In 2009, Landau co-wrote two issues of the Angel comic book series for IDW Publishing, in collaboration with Brian Lynch. The issues (#24 and #25 of the series, appearing in August and September 2009) feature Drusilla, the character she played on Buffy the Vampire Slayer and Angel. In addition to writing, she contributed numerous ideas and references for both the cover and interior art of the issues. She has stated that she would like to write more comics set in the Buffyverse. She was slated to write a five-part Drusilla miniseries from Dark Horse Comics in 2014, which is now delayed.
In 2012–13, she produced and starred in the play Danny and the Deep Blue Sea directed by John McNaughton at the Crown City Theater in North Hollywood. Her portrayal won rave reviews and multiple awards. The show was extended 5 times.
In July 2013, it was announced that Landau had been cast as a new incarnation of the Time Lord Romana in the Big Finish Productions audio dramas Gallifrey VI and Luna Romana, both of which are spin-offs from the TV series Doctor Who. The character of Romana was previously played in Doctor Who (and in the Big Finish audio dramas) by both Lalla Ward and Mary Tamm. In the mythology of the series, Time Lords have the ability to regenerate into new bodies and personalities, hence not only can the role be recast but, as is in the case of Gallifrey VI in which she co-stars with Ward, different incarnations of the same Time Lord may actually meet.