Any ideas on what to make with a partial can of sweetened condensed milk? Just made cookies that only called for 2 tbsps from a 14 oz can.

Unbelievable as it may sound condensed mil (plus cream and other ingredients of you choice) makes wonderful ice cream without a machine (or much time or effort or having to mash the stuff as it freezes) - so I wrote an ebook about it!
http://ow.ly/xtFno

You can add it to corn kernals and process to use in Mexican Lasagna. The now creamed corn can takes the place of Béchamel just add a variety of peppers and build accordingly to taste.

Nigella has a great ice cream that does not require using an ice cream maker: http://www.nigella.com/recipes/view/ONE-STEP-NO-CHURN-COFFEE-ICE-CREAM-5550

in addition to all the good answers - no bake or chocolate biscuit cake (British eg Hugh Fearnly Whittingstall recipe), pumpkin pies or tarts, with Sriracha for a creamy hot sauce

It's a no brainer fmacmac, though it may be an extension of Ida Yu's answer, but I would make a classic Hungry Monk Banoffi Pie, perhaps the greatest desert the modern World has ever known. You could scale it down to make a smaller one if you don't have enough of the condensed milk left over. Here's a link to the original recipe:
http://www.hungrymonk.co.uk/banoffi_pie/

Spread it on toast. Yumm!

Flan!

macaroons

No-churn ice cream:

http://www.nigella.com/recipes/view/ONE-STEP-NO-CHURN-COFFEE-ICE-CREAM-5550

http://www.nigella.com/recipes/view/ONE-STEP-NO-CHURN-COFFEE-ICE-CREAM-5550

http://www.cookrepublic.com/recipe-archive/no-churn-condensed-milk-and-jam-ice-cream/

Other than eating it straight off the spoon? Use it to sweeten coffee or tea, drizzled over berries, cake, bread pudding, french toast, mixed with heavy cream to make a no-churn ice cream, hello dolly bars, rice pudding, etc.

Bake it and make dulce de leche!

Vietnamese iced coffee - only uses a couple of tablespoons of condensed milk per glass, but it's a great warm weather dessert for a group, easily made in a jug to pour over ice (sliced mango, berries, etc. are nice with it.) Assuming you don't happen to have a Vietnamese metal coffee filter lying around - I just use my old-school stovetop espresso maker: http://whiteonricecouple.com/recipes/vietnamese-iced-coffe-recipe/

I've ben enjoying the chai mix here: http://food52.com/recipes/25891-vanilla-bean-chai-syrup.