I love the spawn attacker. Let's me play on my near max SDI spellweaving necro mage while having my sampire set to follow. Cleans spawns up rather nicely.
Also a huge fan of any resource gathering script. I use XIIOver's and Manwinc's. There is zero chance I would ever do that by hand again even if EUO did poof.
Then any script that trains skills. Don't have much play time and when I do, I don't want to be bored training.
Then I love those random scripts like XIIOver's Superstuff.
I think it's easier to just say I love all scripts and more importantly the people who write them!