Caputed RTL-SDR file for playing around?

Hi list, I've stumbled upon the rtl-sdr and am quite excited. Have already ordered a dongle, but it is going to take a while until it arrives. Since I'd like to play around with it already, is there a capture file available somewhere for download to test out the functionality (working with GnuRadio etc)? I.e. someone with a dongle doing ./rtl_sdr /tmp/capture.bin -s 1.8e6 -f 392e6 (or whatever frequency there is something audible on, preferrably something that can easily be identified like FM radio) and publishing the capture.bin file? This might also be of interest to people who consider to play around with SDR, but do not know if they should buy a dongle. Would be very cool if there was something available or somebody on the list could provide one. Best regards, Joe