ExZeus: If you fast forward to around two minutes in, you'll see what I'm talking about. Built by Japanese devs HyperDevBox, ExZeus is based on an obscure shooter-on-rails game that's found its was in some form to Japanese arcades, Dreamcast, PS2 and Wii. Now it's on the iPhone in probably its finest form, going beyond traditional rail shooters with great accelerometer controls (which you can calibrate for sensitivity and orientation to play lying in bed too. which should be a MUST for all motion games. Plus the plotline involves an alien holocaust delivered by an asteroid. Need any more convincing? I's $5.

iSperm: I can't believe no one has thought of this yet: the premise of this game is to guide your sperm (with rose in hand!) down a slightly-too-realistic Fallopian tube to the motherland. $1

Remote Mic: Lets you bug a room with your iPhone. Working kind of like the opposite of AirPhones, the app that routes your computer's audio to your iPhone headphones, Remote Mic sends audio back from the iPhone's mic to a client app on your Mac, allowing you to listen in and record. $1

Bargain Bin: Now the snake is really swallowing its tail—Bargain Bin is an app that helps you more effectively and cheaply acquire other apps by letting you know when they go on sale. Apparently Apple was a little nervous about this, as it sat in approval purgatory for quite some time, but it's out now, for bargain hunters everywhere. Free

This Week's App News On Giz:

• Carnival Hammer iPhone App Invents New Way to Break Your iPhone

• How to: Install Unofficial Apps on Your iPhone 3G or iPod Touch, Easily and Safely

• Make Your iPhone's Wallpaper Useful With Google Calendar and Notes

• iPhone's First Turn-by-Turn Navigation App Reviewed: Outstanding, Not Perfect

• Tweetie 1.3 iPhone App Finally Approved, You Get UI Tweaks

• Oregon Trail iPhone Game Hands On

• CBS's March Madness On Demand iPhone App Streams Every Game, Almost Gets It Right

• iBluetooth Lets iPhone Users Send and Receive Files Over Bluetooth

• Foursquare Brings Xbox-360-Style Achievements to Barhopping

This list is in no way definitive. If you've spotted a great app that hit the store this week, give us a heads up or, better yet, your firsthand impressions in the comments. And for even more apps: see our previous weekly roundups here, and check out our Favorite iPhone Apps Directory and our original iPhone App Review Marathon. Have a good weekend everybody.