Plus! logo has been done with corel draw or paint shop pro (can't remember what's GFD's choice
)
However, the best option is to get a penpad and start juggling shapes, colors, ideas and a lot of imagination. Plus! logo is MSN's butterly certainly distorted and with an exclamation mark ontop. Reminds that it's
MSN Messenger, but also that it's Plus
!. this is a way to mix ideas and find a logo that not only it visually appealing , but also has some meaning behind.