I am a huge fan of the hermfix repositionable dots - it is a bit pricey initially, but the refills are about half the price and it's very easy to refill. When I run out, and have to use my CM tape runner I am so devasted (mainly because the CM one is very permanent, and I just love to be able to reposition)
I also like a glue stick for smaller things that are hard to hermafix (although you can run the hermafix over a small thing lying on a scrap of paper , and the extra dots will just go onto the paper, and can be rubbed off, whereas the CM tape is a fixed width and I often have to trim it off.
You don't need a lot of hermafix, and this is a hard lesson to learn, I used to put it on all 4 edges of my photo, now I just use a bit in each corner.
Bev