telegraph.co.uk – In the nine months since Apple launched its iTunes Application Store, users have downloaded more than a billion apps for their iPhone and iPod touch devices.

But for every Rolando, Flight Control and TwitterFon, there are dozens of humorous, lighthearted and, in some cases, tasteless programs to choose from. The huge success of iFart, which turned the iPhone in to a virtual flatulence machine, has paved the way for a host of imitators.

Here, we round-up 10 of the strangest iPhone apps (note: all links open in iTunes):

BulletFlight: A must for every self-respecting marksman, this app helps gunmen line up a clean shot at their target by calculating factors such as prevailing wind conditions, ammunition type, and distance to the target.
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iBeer: This app, which was at the centre of a legal battle, turns the iPhone or iPod touch in to a virtual pint glass; tip the device to your lips to mimick gulping down the foamy suds.

Dog whistler: Wannabe shepherds will love this app, which emits a whistling sound to call your dog to heel. The only problem is, some of the frequencies are beyond the range of human hearing, so you’ll have to take the developer’s word for it.

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