I hope postgresql performs better now.
Moreover, this is not the first time Sybase makes this offer : Sybase for Linux 11.0.3 was free to use on Linux, with no limitation.
I personnaly used it for my Web shop, as this database is not only fast and secure, but also quite easy to program with ( especially compared to Oracle ).
The only drawback of Sybase is the lack of standard administration Tools. You have to use a product like (overpriced and windows-only) Emabarcadero DBArtisan.