As discussed by the Office Sustained Engineering group cumulative updates for all Office Products including WSS 3.0 and SharePoint 2007 will be released every second month.
Yesterday we released the so called February Cumulative Update. Currently the separate packages for the core products and for the language packs are available.
Details and download locations can be found in the blog my colleague Joerg Sinemus published:
[Update March 9th]
Meanwhile the so called Uber packages for the February CU which contain all updates (localized and global) since SP1 have been released as well. Details about how to install them can be found on the blog of my colleague Joerg Sinemus: