http://arabidopsis.org/portals/genAnnotation/genome_snapshot.jsp
115,409,949 bp (source unkown, but sometime in 2005)
119,186,497 bp (TIGR 2007)
134, 634,692 bp (TAIR 2007)
5 chromosomes
26,819 protein coding genes (on these 5 chr, according to TAIR 7.0)
These numbers only take into account the nuclear chromosomes.
Fred