After finally isolated a couple of annoying platform-specific problems, here's 0.9pre2 for brave folks to download and test.

Changes since pre1:
A few last-minute features:
--define option in CLI tool, to define map-wide hints
rrd datasource accepts a new hint (rrd_start) to define the start time to use instead of 'now'
Fixes:
Website URLs in cacti plugin and generated HTML were the old one.
checks in poller-common for existing, but unwritable files
checks in DrawMap for the same for image files
centering nicely in HTML output (CSS)
more checks for RRD DS to try and find problems
editor file picker sorts by filename now
Lots of ReadConfig regexp tweaks from Niels Baggesen
Some WriteConfig tweaks too from Niels
Fixed bulge-mode - broken in 0.899a8 by percentage changes, and div-by-zero
Fixed editor 'default link width' box to resize previously default width links
Fixed LABELOFFSET tried to work even with no ICON (badly)
Fixed Windows-doesn't-work-anymore bug with rrd data sources

There is one known problem with Debian/Ubuntu where php segfaults. The problem is with the GD library, and not Weathermap though.

It can be downloaded here. Please let me know if you find anything strange!