A couple of open-access papers in the current issue of Proceedings of the National Academy of Sciences are particularly targeted for this community.
In a paper out of Ron Davis' lab at Stanford, the authors describe experiments using "a genome-wide assay for mapping introns in Saccharomyces cerevisiae" they developed with tiling arrays. The technique turned up previously undiscovered introns.
Another paper from the University of Lausanne reports on work from lead author Marta Fierro-Fernández and colleagues on their studies of supercoiling in bacterial DNA plasmids, from which the team posits that a particular topological effect "protects DNA molecules against extensive fork reversals," according to the abstract.