A simple "Builds into" comment would be great for tooltips, but you would stumble across the problem of very base items having a tonne of "Builds into" icons. For guides, however, a little pot/sack of gold at the corner of an item indicating the item gets sold would be cool. Don't know how it'd be coded though.
To be honest, that somewhat prevents these "noobs" from creating bad builds and guides.
Also,
Haunting Guise is pretty good item because it gives penetration, hp and ability power
Also,


This was suggested before, but hasn't been implemented. My guess would be it is not really necessary and might make the mouseover too large. If you click on the item and go to it's item database page it has the things it builds into, so there is a way to see this information even if it's not just by mousing over.
Also, don't worry about making suggestions, it's fine. :P
Also, don't worry about making suggestions, it's fine. :P

Thanks to GrandMasterD for my sig!
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So, here it goes, again since I'm new to LoL, I don't really know which item build into what exactly, if to anything at all !
Thus, while reading a guide, I see a recommendation for
A second scenario, would be a guide recommending
Now, both scenarios could have been solved by a click away from the guide to the items' page, but quite frankly, I think it can be helpful to add it to the tool-tip. I would be more focused on the guide.
It would be even more helpful if the recipe would be added for a single final item. ie: showing the recipe tree for
Sadly, as of now, I can't come up with a more "Helpful" way to deal with