This data can be viewed in the Location tab of Ensembl Genomes pages as resequenced data. It is currently available for 150 strains of Arabidopsis. Click on ´Resequencing
data´ in the left hand side menu, then ´Configure this page´ to add or remove specific strains. See this example.
In addition, variation data from the 1001 Genomes Project can be viewed in the Gene tab (just click on Variation table in the left hand side menu) or added as a data track to any genomic region in the Location tab. This data is under ´Variation set` along other sources. See one example on chromosome 1.