Hi Robert,
if you go to my tutorial on Flickr for PSP http://www.flickr.com/groups/tutorial_corel_pspp_x-x2/ you can see how to do it the esay way 
I did do it that way, in fact I tried several ways to see which worked best.
In the image below I have added the second tree (on left) that used the alpha channel in its original form, but it still gave the pink fringes. The problem is that even the alpha channel image has some grey shaded pixels around the fringes, so when the Magenta colour shows through, these pixels change the colour from a true RGB 255, 0, 255, to a slightly different colour number, so it is no longer Magenta and hence no longer transparent in TFP.
In the third tree, (the one on the right), I dramatically increased the alpha channel image contrast, so that there were no longer any grey pixels, only black and white ones, so this has removed the pink fringes and comes out well. I have added this to my collection.
The woman was done from a PSD but it too has some white fringing particularly around the handbag, where the original cutout could have been closer, but that is easily fixed.
I have only had time to play with these two images, so can't comment on the others obviously. These issues may not exist on the others.
I will have a good look through them as there are quite a number I can use, so thanks again for alerting us to them.
Allan