Yesterday we told you about the Top 10 iPhone apps we’d like to see, and coming in at No. 7 was the personal Internet radio service Slacker. Well, we have some news to report. An anonymous tipster close to the company contacted me and said that both an iPhone app and a BlackBerry app are “about ready to launch.” What’s more, our source says that Slacker will offer both live streaming and caching of content, so you’ll be able to listen to your custom-made stations even when you’re offline (say on a plane or the subway). And, unlike Pandora, you’ll be able to fine tune your stations on the fly. The tipster also promised “better audio quality than other solutions out there” which we take to mean Pandora, AOL Radio, and Last.FM. When we asked about our tip, Jonathan Sasse, VP of Marketing at Slacker, said: “We are very close to releasing the Slacker Radio experience for many mobile devices. This is in-line with our ongoing strategy to deliver Slacker on mobile devices in addition to Slacker Radio Players.” We’ll keep you posted but you heard it here first. Slacker is coming soon to an iPhone or BlackBerry near you. Is it me or is iTunes becoming less and less attractive by the second?