Add categories to slides or a way to tag them
This will make searching much more versatile.
Example categories can be taken from Haiku Deck's pinterest board: http://www.pinterest.com/pin/422775483739123043/
If you decide to implement this, you should extend it so that slides can be in multiple categories/have multiple tags.
A good search/filter makes slides easier to access, especially through Google. I find myself searching for information and I see different slide presentation sites pop up in the results. Not only does it help me understand the topic, it adds hits to your sites and encourages sign-ups (if they see a sweet presentation and want to create something like that)
We’ve made it possible to tag decks! Learn all about it in the docs: http://help.slides.com/knowledgebase/articles/1838059-organizing-decks-tags
I agree, it would be helpful to have tags or something similar for decks. With more than 100 presentations in an account it can get really difficult to find things in one long list. I guess the most flexible solution would be if one deck could have multiple tags and if there was a search function to combine those (eg. find all decks that have tags #english, #training and #acmecompany).