It depends on what I'm using it for ... I like my CM tape runner and Glue Glider Pro for photos, Glue Dots for embellishments, and xyron for smaller stuff. I also love my WackyTac sheets for really intricate items and die cuts.
I love Scotch brand photo splits. I also really love the Kokuyo Dot N' Roller adhesive, and Glue Dots . For some things (bigger and bulkier embellishments), I still refer back to my good ol' Tacky Glue.
Glue Dots , Herma adhesives, ad tech tape runners and Tombo as well. and of course STICKLES GLITTER GLUE! tacky glue and mod podge for covering chip board. ZIG 2way glue for diecut letters and small things. foam squares for popping up. Its hard to choose just one kind of glue!
I love double sided adhesive squares. The are made by Fiskars and a couple other brands (I can't find them in the superstore) They come in a dispenser, and I use them for anything flat (paper or photos)