Your team's pretty good. Just a few suggestions:
You could probably get rid of Swisher, who may come around, but you're pretty well covered for HR, and he hurts you in SB and AVG. Try going for someone like Willy Tavares or Kenny Lofton, if they're available. You could use more speed.
Freel is a good player, but if Julio Lugo is available (he may not be, but is getting dropped frequently) I would go get him. One problem with Freel is that he gets these really long periods between steals, and as fast as he is, that's annoying to a fantasy owner. Kaz Matsui could actually get you more than Freel too.
Tulowitski probably shouldn't be using a UTIL spot for you. He's a solid choice as a SS, but you could probably trade him away for someone that gets SB, or suits your needs some other way.
As far as pitching goes, you can probably get rid of Maholm. There are better options available, such as perhaps David Wells, Jeff Weaver (who's come on strong after a putrid start) Chuck James, or Dave Bush.
Your relievers look fine, although I'd keep an eye on Brad Hennessey. Hope this helps, and good luck!