I'm also finishing up the second Malabrigo Mitt in Mariposa. The matching glove has been sitting half-knit for about six months.
As for the summer top I'd like to knit, the following are some of my favorites (at least, these are the ones I have stashed yarn for):
Buttercup (ravelry link)
Cherry (previously started)
Additionally, the next shawl I'm planning is the Waves of Leaves shawl.
I'm finally going to use my Kool-Aid yarn. I totally dig this funky colorway, and I think the shawl pattern is perfect for it.