You know the entry "Aspects of Magic" in the Thaumonicon? Yea, it's neat and all, however if you play with a lot of mods, some items or blocks might've just the 2-3 aspects all in one of them that you want to drop into the crucible.

Here's my idea: A sort of Aspect and Item/Block filter. You select the aspects you need and the items/blocks that have those aspects are highlighted/filtered. Like if I select aqua, aer and herba, I get Sugarcane and other items filtered/highlighted.

So basically a multiple-input search for items by aspect content, correct? This would indeed be useful.

Thaumcraft NEI Plugin does something similar to this. It adds an item for each aspect to NEI. Right-clicking (U) on one shows what recipes use that aspect, whether alchemy, crafting, or infusion. Left-clicking (R) on an aspect shows how to obtain that aspect. However, again, it's only for one at a time.

Perhaps something like a Mnemonic Aspect Tome, or an Alchemical Index, made by right-clicking on a TC table with a specific item. Shows nothing until at least two aspects are selected, then lists items, with options to sort by amount of first aspect, amount of second aspect, or total aspects. Probably best to limit it to three or four aspects at once.