The banks may have retreated over cash machine charges but they are still well dug in when it comes to the millions of pounds gleaned from accidental overcharging of fees. Step forward, then, www.checkyourbank.com, a sort of "people power" page run by chartered accountants that (funnily enough) checks for signs of bank overcharging. All you have to do is gather your bank statements and paying-in books for the period concerned, work out the start and end date of the charging period, identify overdraft limits, interest rates used and any special tariffs agreed with your bank, register and punch in the details, and let these vigilante accountants work out the figures. The service is free until you need a detailed rundown of any overcharging with which to confront the banks. The cost? £12.50.

Speaking of overcharging, you no longer need to remortgage your house for a limp cheese-and-pickle sarnie or a stewed cuppa, thanks to another web vigilante offering a guide to the "treats" served up by motorway service stations. Clearly signposted in motorway blue, www.5minutesaway.com offers visitors 1,500 alternative stops (soon to rise to 4,000) - such as petrol stations, shops, restaurants, pubs and leisure services - that all lie within five minutes or three miles of major junctions. Just tap in the junction number and service you desire and, hey presto, the turn-off becomes a turn-on.

Continuing the spirit of choice and openness is www.opendiary.com ("the first interactive diary community on the internet"). Here voyeurs can poke their noses into any one of the 119,000 or so different online diaries from "63 different countries". If you want to find out what teenage American FrostyPolarBear did yesterday or why the Paranoid Android is dealing with the role of male cleaners in modern-day society, then this website is for you. To separate the wheat from the chat, tap into the Readers' Choice Top 50 for the best diaries. Samuel Pepys eat your heart out.

Spotted any good sites? Let us know at the.editor@theguardian.com