30.000 MHz, 35.000 MHz and 40.000 MHz all lie within military/government portions of the 30-50 MHz VHF low band allocation as well. 30.000 is the "default" channel for the US military's SINGCARS VHF-FM radio system in single channel/SC (read: non-frequency hopping, or "FH") mode <--- fun fact. 45.000 MHz is a public safety frequency and 50.000 MHz is, well, hopefully you all know what that's a part of. With the migration of broadcast TV stations to the VHF-high and UHF bands with the DTV transition I could see 55 MHz though.
Still, having WWV on 25.000 MHz is awesome. I love chasing sporadic-E DX on the 11 meter band and, when it's around, in the 30-50 MHz VHF low band portion. There's still heavy use of the 30/31 MHz region by various land mobile systems around the country, and then of course there's Latin America. Not to mention the 33 MHz fire department band, which, believe it or not, is still used extensively in certain areas. I remember one band opening where I scanned 29.7 MHz to 35 MHz and 33-34 MHz was nothing but fire dispatch traffic, 30.58 MHz to 32 MHz was seemingly endless Spanish language chatter (all in FM mode with CTCSS or DCS tone squelch) ...a stray trucking company or construction crew thrown in for good measure.
I don't know if its still active and/or on the same frequency but another good indicator of a Sporadic-E opening used to be Fort Hood Texas range control on 30.450 MHz FM (150 Hz CTCSS, but often decoded as 151.4 Hz CTCSS).