I wasted a lot of time before buying the Hashimi MSBuild book, fantastic -- I concur with this review by Steven St Jean.
In addition to an excellent all-round introduction to MSBuild scripting, it has a cookbook section on doing typical build automation thigns like build numbers etc. Obviously the last TeamBuild section will not be directly relevant for you, but a lot of the topics are generic across all CI tools.
UPDATE: The 2nd ed keeps up the trend, adding a must-have section re WebDeploy