From Qt Apps:
Version 1.5.3 of LyX, a WYSIWYG editor which produces LaTeX output, has been released. Changelog:
This is a maintenance release that further improves the stability and the performance. Besides numerous crashes, the display problems that slipped into 1.5.2 with the performance fixes (on the Mac and on Windows) as well as problems entailed to the reworked document classes were fixed. Furthermore, LyX 1.5.3 comes with speed improvements that should pay off especially on the Mac and other UNIXes. Finally, this version also provides some new features (detailed list here).
Screenshots here, downloads (source, OpenSUSE download) here. Requires Qt 4.1 (full requirements list here).