The sites listed below all have connections to the Antiquarian / Secondhand Book Trade and some have a more direct association with 84 Charing Cross Road.

Cecil Court is a small side street off Charing Cross Road. Here you will find bookshops, art, music, stamp and map dealers. The shops here appear to have changed very little in the last 40 years and will provide the visitor with a glimpse of what life was like when Marks & Co traded just a short distance away.
This site is owned and maintained by The Cecil Court Traders' Association and features most of the shops trading in this unique thoroughfare. The Association would like to hear from anyone with experiences or reminiscences of Cecil Court, be that business or pleasure! You can email Tim Bryars with any information.

Sheila Markham Rare Books From 1991 to 2004 Sheila Markham's series of interviews with Booksellers were published at regular intervals by The Bookdealer magazine. In 2004 a collection of these interviews appeared in book form (limited to 500 copies), a paperback edition was published in the autumn of 2007. After an absence of almost two years The Bookdealer was re-launched in April 2007 and Sheila Markham's fascinating 'potted biographies' began to appear again. More recently (2011) her interviews have appeared in the quarterly journal The Book Collector. This link goes directly to the Interviews index.

Helene Hanff the definitive web site created and maintained by Angela Garry. The site, created in 1997, should be the first port of call for all HH fans. Updated as of 2016
The Book Guide provides an excellent resource for Antiquarian and Secondhand book buyers. Searchable lists of Bookshops, Fairs and Auctions in the UK plus online databases together with reviews and comments.
David Brass Rare Books David Brass is a "fourth generation" antiquarian bookseller, a member of the dynasty founded by his Great Grandfather Emmanuel Joseph in the 1880's. Ben Marks was David's Great Uncle. An Englishman, he now runs his business from California where he has lived since 1993.
Ollie Childs Oliver 'Ollie' Childs is an aspiring young(ish) English singer songwriter. He is also Frank Doel's grandson. This link will take you to Ollie's Web site.
Cafe in the Crypt Anyone visiting Charing Cross Road or Cecil Court will find the excellent and atmospheric cafe in the crypt of St. Martin's in the Field church in Trafalgar Square well worth a visit.
Helene Hanff Yahoo Group This discussion group has been in existence since 1998 but sadly, perhaps due to the rise in popularity of Social Media sites (Facebook etc) it's not used as much as it was. If you are interested in exchanging information, thoughts or views with other 'Hanffian aficionados' and are not entirely comfortable with Social Media sites then this could be the place for you.