Good 7th-level Module
"Tears for Twilight Hollow" from DUNGEON Magazine #90. It's based in the Forgotten Realms Campaign Setting, but it's easily adaptable. It's a good, long, super creepy adventure with a number of neat locations to explore. This adventure is freaking awesome!
"Kambranex's Machinations" from issue #91 is also excellent, but it's originally intended for 9th-level characters. If you use the "Scaling the Adventure" sidebar and a little elbow grease, it could work for 7th-level characters. It has a cool new template in it, as well.
"Vanity" from issue #93 is intended for 5th-level characters. It's a great, short dungeon crawl that can also be easily adapted for 7th-level characters. Again, just reference the sidebar. "Swamp Stomp," also from issue #93, is for 4th-level characters but can also be easily adapted. It's mostly location-based (in, you guessed it, a swamp), but also involves some city intrigue and sleuthing.
In issue #94, we're printing an adventure called "Bloodlines" for 7th-level characters. It's an uber-nasty dungeon crawl that features a really cool villain. Of course, since issue #94 won't be out for another couple of months, that probably doesn't help you now.
If you have access to DUNGEON issues from further back, I can give you some more tips; these are just the most recent ones we've printed.