All of the tags currently available are accessable from the create/edit custom template page (there are buttons for each), but here is a list of them for your reference:
[STORE_WINDOW] - inserts the Auctiva Store Window in your auction at this location instead
of its usual at the top or bottom of the listing
[TITLE] - the title of your auction
[SUBTITLE] - the subtitle of your auction
[SHIPPING] - your shipping details as defined on Profiles->Seller Details
[PAYMENT] - your payment details as defined on Profiles->Seller Details
[TERMS_OF_SERVICE] - your terms of service as defined on Profiles->Seller Details
[ABOUT_ME] - your about me information as defined on Profiles->Seller Details
[CONTACT_US] - your contact us information as defined on Profiles->Seller Details
[DESCRIPTION_AND_IMAGES] - this tag inserts your auction description along with your images. The images will be inserted into your description using the location and layout that you specify on the lister page, like one of our regular templates. We use 400x300s with a 'click to supersize' link.
[DESCRIPTION] - instead of the above tag, you can use this one to insert the auction description only (no images), then use the tags below to specify the location/type of images.
Use Auctiva's auto-arrangement feature for your images (this utilizes the 400x300 with click-to-supersize):
[IMGS_VERTICAL] - images will be in a straight verticle line, one on top of the other
[IMGS_PAIRED] - images will be in a verticle line, paired up two-by-two
[IMGS_HORIZONTAL] - images will be in a horizontal line, one next to the other
[IMGS_SLIDESHOW] - your images will play in a slideshow, with one image being visible at a time and switched out for the next one every few seconds
-- OR -- Place each image individually:
[IMAGE1_URL] - the image URL only, you must create the <img> HTML tags
[IMAGE1_URL400x300] - the image URL for a 400x300 version of the image only, you must create the <img> HTML tags
[IMAGE1_URL96x96] - the image URL for a 96x96 version of the image only, you must create the <img> HTML tags
[IMAGE1_ORG] - the entire HTML <img> tag for your original image, no resizing, borders, click-to-superize link, etc.
[IMAGE1] - the entire HTML <img> tag for a 400x300 version of your image with a click-to-supersize link around it. (Of course smaller images will not be resized)
We have been adding more as we get the demand, so any feedback is appreciated as usual. I hope this helps.
-- Auctiva David