jl98584 has done a great post outlining in detail how to insert a photo from Flickr directly into your Travellerspoint blog entry. For any of you that don't want to upload photos to multiple sites, but still want all the great functionality (moblogging, interactive maps, video, Feedburner and Google Analytics tie-ins, yes you can even make money off your blog!) that comes with a Travellerspoint blog, this is a great way to go.
Although the instructions are specific to Flickr, in principle they should work for any other site that hosts your photos, including Facebook, MySpace, SmugMug etc. Just include the links to your photos in the IMG tag and you'll be set!