I've completed the merging of dasBlog 1.4.3297.1 into my code and it all appears to be running fine.
The biggest changes are a new WYSIWYG editor, courtesy of FreeTextBox, cross posting functionality added (which is little use to me), additional statistics (referrers, click-throughs, rss tracking)
There also appeared to be some improvements in the APIs that can be used by blogging clients, but there are few details on the dasBlog site regarding this, so I'm not sure what they are. In addition to syndicating to RSS and ATOM, dasBlog now syndicates to CDF, not that I know what that is...
UPDATE: The CDF lets you “subscribe” in the IE favorites via IE's Active Content system. It shows the site and expands to the items on the page. Kind of like a budget RSS aggregator.
UPDATE: My permalinks appear to have all changed to a new format. This leads me to believe that if you aggregate my site, all stories will appear to be new again. I'm not sure who made this decision, but the trouble doesn't seem to be worth what it gains by being reformatted. Any-which-way, my apologies if you have to mark all items read again.