http://www.froebe.net/blog - an active Sybase DBA blog
James Xing - an active Sybase DBA blog
MCOB Technology - an active blog with comment on Sybase ASE and Sybase Inc
Team Sybase - product evangelists, the blogs are primarily Powerbuilder and SQLAnywhere related.
Blogs from Sybase Inc - Sybase engineers started blogging in early 2007.
Sybase Inc - the vendor of Adaptive Server Enteprise
ISUG - the Independent Sybase Users Group
Rob Verschoor - Rob has written several excellent books on Adaptive Server Enterprise
Gem - Ed Barlow's site provides a toolkit for DBAs, along with other resources and articles
DBA-Sybase - useful information for Sybase ASE in the form of case studies, scripts and how-to documents for DBAs. You can read our review of the site